From January 2015, she started to practice leetcode questions; she trains herself to stay focus, develops "muscle" memory when she practices those questions one by one.
2015年初, Julia开始参与做Leetcode, 开通自己第一个博客. 刷Leet code的题目, 她看了很多的代码, 每个人那学一点, 也开通Github, 发表自己的代码, 尝试写自己的一些体会.
She learns from her favorite sports – tennis, 10,000 serves practice builds up good memory for a great serve. Just keep going.
Hard work beats talent when talent fails to work hard.
In this second installment of the Dataflow course series, we are going to be diving deeper on developing pipelines using the Beam SDK. We start with a review of Apache Beam concepts. Next, we discuss processing streaming data using windows, watermarks and triggers. We then cover options for sources and sinks in your pipelines, schemas to express your structured data, and how to do stateful transformations using State and Timer APIs. We move onto reviewing best practices that help maximize your pipeline performance. Towards the end of the course, we introduce SQL and Dataframes to represent your business logic in Beam and how to iteratively develop pipelines using Beam notebooks.
This course is part 1 of a 3-course series on Serverless Data Processing with Dataflow. In this first course, we start with a refresher of what Apache Beam is and its relationship with Dataflow. Next, we talk about the Apache Beam vision and the benefits of the Beam Portability framework. The Beam Portability framework achieves the vision that a developer can use their favorite programming language with their preferred execution backend. We then show you how Dataflow allows you to separate compute and storage while saving money, and how identity, access, and management tools interact with your Dataflow pipelines. Lastly, we look at how to implement the right security model for your use case on Dataflow.
Prerequisites:
The Serverless Data Processing with Dataflow course series builds on the concepts covered in the Data Engineering specialization. We recommend the following prerequisite courses:
(i)Building batch data pipelines on Google Cloud : covers core Dataflow principles
(ii)Building Resilient Streaming Analytics Systems on Google Cloud : covers streaming basics concepts like windowing, triggers, and watermarks
How to be a good stock investor as a value investor and long term investor? I spent first hour in the morning to watch RIG go up 5% and then down 0% since treasury yields. I also learned my own behavior to sell over $30,000 US dollar oil stock on Sept. 27, 2021, and then I missed today gains on RIG and GTE stocks in those early hours.
More reading | Yields | Highlights to review later
Stock market news live updates: Stocks drop, Nasdaq sinks as Treasury yields climb
Stocks sank Tuesday, with technology stocks leading the way lower as investors nervously eyed a swift rise in U.S. Treasury yields.
The Nasdaq, a proxy for technology and growth stocks, underperformed against the other two major stock indexes, dropping more than 1% just after market open. Both the S&P 500 and Dow also dipped.
The rapid rotation away from growth and technology stocks came as Treasury yields added to recent gains. The yield on the benchmark 10-year note (^TNX) jumped more than 5 basis points to top 1.54%, reaching its highest level since June.
Yields, which move inversely to prices, have held at low levels throughout the pandemic, and rising yields are seen in large part as a bet on a strengthening economic environment. However, the rapid rise in borrowing costs also serves as a headwind to "long-duration" growth stocks, which are valued heavily on future earnings.
Oil prices also added to gains, and positive economic data including a much stronger-than-expected durable goods report out Monday helped underpin the move. West Texas intermediate crude oil futures (CL=F) were on track to climb for a sixth consecutive session and broke above $76 a barrel, or the commodity's highest price since July. And Brent crude oil, the international standard, touched $80 per-barrel level to reach its highest since October 2018.
"Really what you're seeing is, across asset classes, the market [is adopting] a pro-cyclical view, which means better growth in the future, higher inflation, higher bond yields," Tom Essaye, The Sevens Report Research Founder, told Yahoo Finance Live. "You're seeing that from commodities through to equities."
Investors also continued to watch developments out of Washington, with lawmakers facing a deadline this week to fund the government by Thursday night to avert a government shutdown.
The effort to pass a new government budget has been swept into ongoing debates around whether or not to raise the federal debt ceiling and pass an expansive $3.5 trillion reconciliation package, which would advance a number of initiatives central to President Joe Biden's economic agenda. In a move widely expected, Senate Republicans on Monday evening blocked a bill that would have funded the government through Dec. 3 and also raised the debt ceiling through the end of 2022. While Democratic lawmakers have called for raising the debt limit to be a bipartisan move, Republicans have argued Democrats, as majority members of both chambers of Congress, should increase it without their support.
Federal Reserve Chair Jerome Powell and Treasury Secretary Janet Yellen are also set to testify before the Senate Banking Committee on Tuesday about the Fed and Treasury's responses to the pandemic. In prepared remarks, Yellen addressed the ongoing debt ceiling debate, reiterating her concern over the negative implications to the U.S. economy, should lawmakers fail to take action.
"It is imperative that Congress swiftly addresses the debt limit. If it does not, America would default for the first time in history," Yellen said in the remarks. "The full faith and credit of the United States would be impaired, and our country would likely face a financial crisis and economic recession."
For investors, the plethora of overlapping debates in Washington could be a near-term source of more market choppiness.
"I think there's the opportunity for volatility to pick up a little bit," Eric Freedman, U.S. Bank Wealth Management chief investment officer, told Yahoo Finance Live on Monday.
"Not only do you have concerns about the debt ceiling and what legislation may come out, but you also have concerns about when the Federal Reserve may step in, and you also have earnings come up," he added. "So we're in that shoulder period for the next couple of days when the only announcements coming from companies tend to be negative ones. We've had some of those over the past week, particularly focusing on cost pressures."
—
9:40 a.m. ET: U.S. goods trade deficit increased more than expected in August
The advance U.S. merchandise trade deficit reached $87.6 billion in August, yawning from the $86.82 billion posted in July, according to Commerce Department data on Tuesday. The increase came as imports rose 0.8%, outweighing a 0.7% increase in goods exports.
—
9:30 a.m. ET: Stocks open lower as Treasury yields climb
Here's where stocks were trading shortly after the opening bell Tuesday morning:
9:01 a.m. ET: Home prices reach record high for fourth straight month in July: Case-Shiller
U.S. home prices increased further in July, setting a new all-time high for a fourth consecutive month as elevated demand and materials shortages pushed up housing prices further.
The S&P CoreLogic Case-Shiller national home price index rose at a 19.70% rate in July over last year, accelerating from June's 18.73% monthly increase. The 20-City Composite Index, which tracks home price changes in 20 major metropolitan areas across the country, rose 19.95%, accelerating from June's 19.14% increase but coming in a hair below the 20.00% rise expected, according to Bloomberg data.
Over last month, however, the 20-City Composite Index decelerated slightly. The index rose 1.55% in July compared to June, after rising at a 1.79% monthly pace during the prior month. Consensus economists were looking for a 1.70% monthly increase in July.
—
7:38 a.m. ET Tuesday: Stock futures drop, Nasdaq underperforms
Here's where markets were trading head of the opening bell:
S&P 500 futures (ES=F): -40.75 points (-0.93%), to 4,392.25
Dow futures (YM=F): -164 points (-0.47%), to 34,579.00
Nasdaq futures (NQ=F): -255.25 points (-1.68%) to 14,939.50
The government said it hopes to never have to use the digital proof of vaccination for such a reason and is instead relying, quite desperately, on the population to get their two doses of the vaccine by Aug. 31.
Recently, a team of cybersecurity experts got together to test the security and safety of the QR codes sent to hundreds of thousands of Quebecers so far.
The so-called “ethical hackers” were able to crack the codes using a fairly rudimentary program that decodes the visual symbols.
Those involved in the hack are asking why the government did not opt for a more robust security method involving encryption, which is far more difficult to crack.
“There are a lot of people that say, in social media, we’re already giving that (kind of personal) information. The thing is we’re giving this information voluntarily to a private company,” said Patrick Mathieu, co-founder of Hackfest, billed as the largest hacking event in Canada.
“(But) now it’s the government forcing us to access a public space or private event. Facebook doesn’t require you to give your information when you want to go to a cinema, but the government might ask you to do so.”
Even if the QR codes are never needed to be used within the province, they can be shown abroad when travelling to countries, such as those in Europe, that require proof of vaccination for entry.
In a statement, the ministry of health said the QR code is “completely secure and the government would “never put Quebecers’ data at risk.”
“The Ministry of Health is studying and following international standards in this major operation. And for double authentication, the QR code will have to be accompanied by a proof of identity on site. The QR code is designed to be read and is unencrypted, in accordance with the international standard determined by the WHO, a position supported by the VCI (Vaccination Credential Initiative) for Smart Health Card (a group of public and private organizations),” the statement read.
“The QR code is not forgeable. It contains an encrypted signature from the Quebec government. It does not constitute proof of identity. Therefore, to avoid fraud or identity theft, the QR code must be combined with proof of identity.”
The ministry added that there are still several weeks of testing left to iron out technical details of the QR code program.
Mathieu said the current codes were relatively easy to create and that encrypted codes would require more elaborate set-ups, but would require more people and more money to develop.
A medicine ball is a weighted exercise ball used for full-body strength and endurance training among athletes.1 It is also a common tool used in physical therapy settings to promote stability and aid in recovery. As a popular piece of fitness equipment that sculpts and tones the arms, shoulders, back, core, and more, a medicine ball can also be easily used at home to enhance your workout.
Build strength and stamina with these 14 weighted ball exercises for beginners to sculpt and tone your arms and shoulders while working your core and lower body.
Medicine Ball Exchange
Verywell / Ben Goldstein
The medicine ball exchange is a great warmup exercise for your arms and shoulders and a surefire way to get your heart rate ramped up. You'll also feel the burn in your abs as you work to maintain good posture throughout this strengthening move.
You can perform the sequence from a seated or standing position. For beginners, the key to maintain good form is to start with a lighter medicine ball (4–6 pounds) and maintain slow and controlled movements as you go. If you've worked with weighted balls before, you can intensify the medicine ball exchange with a heavier ball (8 pounds) and incorporate a toss at the top.
From standing or seated, hold your spine upright and engage your core.
Bring the medicine ball to your right hand with your arm down at your side.
Draw the right arm overhead and take the ball with the other hand.
Circle the left hand down to your side with the ball.
Continue circling the ball overhead, alternating the arms, and maintaining a steady pace as you go, relying on strength versus momentum.
Optional: Add a toss at the top of the movement for more intensity.
Repeat for 1–3 sets of 15–20 reps.
2
Medicine Ball Curl and Press
Verywell / Ben Goldstein
The medicine ball curl and press targets the biceps, shoulders, and lats. The exercise will also work your abs as you maintain stability with an upright spine. You can do this from a seated position, as shown, or from a standing position.
Use your upper body and core rather than throwing your body weight into the movement. By distributing your weight evenly under your seat and/or both feet, you'll stay balanced on both sides of the body.
From standing or seated, engage the abdominal wall and hold your spine in an upright and neutral position.
Place the medicine ball in the right hand down by your side.
Balance the ball in your hand as you curl the arm up into a biceps curl.
At the top of the movement, push the arm out and up, engaging the shoulder girdle.
Bring the ball back down and then lower the arm to its starting position.
Repeat for 1–3 sets of 10–12 reps, switching sides for each set.
3
Knee Lifts with a Medicine Ball
Verywell / Ben Goldstein
The medicine ball can be used as a tool to increase the heart rate with minimal impact. Knee lifts with a medicine ball incorporate both upper- and lower-body strength and stability. As you build endurance and get your heart pumping, you will no doubt break a sweat with this exercise.
Depending on your strength and level of fitness, hold a weighted ball (2–8 pounds) overhead with both hands.
Lift the right knee up to waist level while bringing the arms down, touching the weight to the knee.
Take the weight back up and switch sides, lifting the left knee up while touching the medicine ball back to the knee.
Keep the torso upright throughout the exercise and avoid rounding or arching your spine.
The quicker you go, the more intense this movement will be. But faster is not necessarily better—be sure to move at a pace that allows you to maintain control of the weighted ball as well as good form.
Repeat for 30–60 seconds.
4
Medicine Ball Triceps Extension
Verywell / Ben Goldstein
The medicine ball triceps extension is a weighted ball exercise similar to traditional arm extensions with dumbbells. You can increase the intensity by tossing the ball over to your workout partner after extending your arms. This explosive movement builds arm and shoulder strength while focusing on hand-eye coordination. Your partner can sit across from you and the two of you can perform the exercise together.
From standing or seated, engage your abs and hold your spine upright.
With a medicine ball in both hands, extend your arms overhead so they frame your ears.
Allow your shoulders to naturally lift to follow the extension of your arms, neither shrugging them up by your ears nor jamming them down your back.
Bend your elbows, lowering the ball behind your head until your elbows form 90-degree angles.
Squeeze the triceps to straighten your arms, taking the ball back up again.
Repeat for 1–3 sets of 10–16 reps.
5
Medicine Ball Squat and Sweep
Verywell / Ben Goldstein
The medicine ball squat and sweep is a great full-body exercise that strengthens both the upper and lower body in one dynamic move. Use this as part of your warmup for other lower body exercises or to get your heart rate up during your cardio workouts.
Stand with feet hips-width apart and hold a heavier weighted ball (8 pounds or more).
Squat as low as you can, sending the hips back and keeping the back neutral, and touch the ball to the floor, if you can.
Press through the heels and continue to keep the spine neutral as you stand back up, sweeping the weight up and overhead.
Lower and repeat, moving quickly, but still maintaining control of the weight. Add a toss at the end for more intensity.
Repeat for 30–60 seconds.
6
Medicine Ball Squat and Swing
Verywell / Ben Goldstein
The medicine ball squat and swing is similar to the squat and sweep, except that you take a big step out to the side. It's also a great move that sculpts the entire body, engaging the glutes, hips, thighs, arms, and core as you move from side to side. Use a lighter medicine ball if you're a beginner or are still warming up, or move to a heavier one if you're ready for more intensity.
Hold a medicine ball (4–10 pounds) in both hands with your feet together.
Step out to the side into a squat, swinging the medicine ball between the knees.
Sit the hips back with the knees behind the toes and abs engaged.
Step the foot back in as you swing the medicine ball overhead.
Step out to the other side and swing the medicine ball down between your knees.
Step back together, swinging the weighted ball back up, and repeat for 1–3 sets of 8–16 reps.
7
Medicine Ball Squat, Dribble, and Toss
Verywell / Ben Goldstein
The medicine ball squat, dribble, and toss is another full-body exercise that can accompany your cardio workout, since the dynamic movements will get your blood pumping and increase your heart rate. The squat offers a lower-body and core workout, while the weighted medicine ball strengthens the arms, shoulders, and back.
The toss at the end takes some coordination, particularly as you practice good posture and form. To avoid injury, it's best to stand with your feet apart about the width of your outer hips (neither too wide or too narrow), and maintain a tall and neutral spine.2
Stand and hold a medicine ball in front of you.
Toss the ball up in the air, just above your head.
As you catch it, squat down as low as you can while maintaining good form, sitting the hips back and keeping the knees behind the toes.
While squatting, throw the ball to the floor and let it bounce back up into your hands.
Stand back up while tossing the ball in the air, and repeat for 1-3 sets of 10–16 reps.
8
Medicine Ball Circle Squat
Verywell / Ben Goldstein
The medicine ball circle squat strengthens the arms and shoulders while working the lower body and core. You'll also get your heart rate going, making this move a great addition to any cardio or strength-training routine. Because this exercise is low impact, you'll protect your joints3 while improving your fitness.
Stand tall with your feet hips-width distance apart and hold a weighted ball in both hands on the right side, next to your hip.
Circle the medicine ball overhead and slightly in front of you as you step sideways with the left foot.
Continue to circle the ball around to the left and down, and lower yourself into a squat. The ball should be at the bottom of the circle, between your legs, at the bottom of the squat.
Circle the ball back to the right as you return to standing and step the left foot back in.
Repeat for 10–16 reps. Switch sides, and do the same motion in reverse for 10—16 reps.
Repeat for 1–3 sets.
9
Medicine Ball Diagonal Woodchop
Verywell / Ben Goldstein
The medicine ball diagonal woodchop is a dynamic exercise that strengthens the upper and lower body while targeting the abs and obliques. The diagonal move is a functional movement pattern, as the arms reach to naturally rotate the torso much as it would in real life when picking something up off the floor. The triceps, lats, and shoulders will strengthen as the arms reach down and up.
Begin with the feet together and hold a medicine ball overhead at a diagonal toward the right side.
Step out to the left onto a lunge, swinging the ball across the body toward the left side.
Make sure the knee is behind the toe and rotate through the torso, taking the ball toward the back the room as far as you can.
Step the left foot back to start while swinging the ball up and at a diagonal.
Repeat for 10–16 reps before switching sides, completing 1–3 sets.
10
Modified Medicine Ball Woodchop
Verywell / Ben Goldstein
Regular medicine ball woodchops are great for working the abs and obliques, but this modified version, which maintains lower body stability, actually targets the core with slightly more intensity. With this move, you want to keep the hips and knees parallel throughout the exercise since there is less rotation in the torso. Your arms will still get a workout as you reach the weighted ball overhead.
Take a wider stance with the feet, and hold a medicine ball in both hands.
Squat, sending the hips behind you as you maintain a neutral spine, and take the ball to the outside of the left hip.
Keep the hips and knees facing the front of the room.
Push into the heels to stand up and swing the ball up and overhead at a diagonal, so the the ball is over the right shoulder.
Repeat for 10–16 reps before switching sides, completing 1–3 sets.
11
Medicine Ball Lunge with Toe Touches
Verywell / Ben Goldstein
The medicine ball lunge with toe touches is a great full-body exercise that strengthens your lower legs and glutes while simultaneously toning the arms. The power behind this movement will also get your blood pumping and increase your heart rate.
Additionally, you'll improve the strength and flexibility of your hamstrings, which can aid in injury prevention down the road.4 This move also tests your balance, a practice that has been shown to reduce the risk of falls among older adults.5
Stand tall holding a medicine ball overhead, and step back with the right leg into a straight leg lunge.
Make sure you step back far enough that the front knee is behind the toe.
Still holding the medicine ball overhead, step the right leg forward and swing it up, bringing the medicine ball down toward the toe.
Touch the toe if you can (this will depend on your flexibility) and take the right leg back into the lunge.
Continue the lunges and toe touches on one leg before switching sides.
Repeat for 1–3 sets of 10–16 reps on each side.
12
Medicine Ball Knee Pulls
Verywell / Ben Goldstein
Medicine ball knee pulls are a total-body workout that incorporate the use of a sliding disc (pictured here). The standing leg gets most of the work as you slide the other leg in and out. If you keep the standing leg in a squat position for the entire set, you'll really feel the effort in the glute and thigh muscles on that side. You'll also sculpt and tone the arms and shoulders as you lift and lower the ball.
Adding a weighted ball will get your heart rate up and strengthen your upper body as well. If you don't have a sliding disc, you can use a paper plate, a sock, or simply touch the foot in and out as a modification.
Hold a light medicine ball and place a sliding disc, sock, paper plate, or nothing at all under the left foot.
Bend the right knee into a squat as you slide (or tap) the left foot straight back behind you.
Keep all the weight in the heel of the right leg.
Simultaneously push the medicine ball out in front of you.
Bring the weighted ball back in as you slide the left foot back to start, keeping the right knee bent the entire time.
Continue to slide the foot back as you take the medicine ball out for 8–16 reps before switching sides.
Try to keep the right knee bent in a squat throughout the exercise for maximum intensity. Imagine there's a ceiling just overhead that you'll hit if you come up too high.
13
Medicine Ball Pullover
Verywell / Ben Goldstein
This medicine ball pullover is similar to a dumbbell pullover in that it targets the arms, lats, and shoulders, but you'll also feel the work in your core as you maintain stability. In this move, you have a firmer grip on the ball, but your hands are rotated, which puts much of the emphasis on the bottom arm.
The medicine ball pullover can be very challenging work for the shoulders, particularly for those experiencing a lack of mobility or tightness in this region. To avoid injury, start with a very light ball to get a sense of the exercise and how much weight you can safely accommodate.
Lie down on a step or bench and hold a medicine ball between both hands above your shoulders.
Rotate the ball until one hand is on top and one hand is on the bottom.
Gently and slowly lower the ball behind your head with your arms extended while engaging your core to avoid overarching your lower back.
Only lower as far as your arm strength and shoulder flexibility allows.
Lift the ball back up and rotate it, so that the other hand is on top, and lower the ball again.
Repeat for 1–3 sets of 8–15 reps.
14
Medicine Ball Knee Roll
Verywell / Ben Goldstein
The medicine ball knee roll gives the arms a rest and is a great conditioning exercise to strengthen and stabilize the abdominal wall. An exercise ball offers additional support and allows you to rock easily from side to side while also controlling the movement.
Lie on the floor with the backs of your calves resting on an exercise ball with your knees bent.
Squeeze a medicine ball between the knees, and take your arms out to the sides for more stability.
Maintain a neutral spine and slowly roll the ball to the right as far as you comfortably can, feeling your abs engage.
Roll back to the center, then roll to the left.
Repeat for 1–3 sets of 8–15 reps (1 rep is to the right and left).
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000_medicineexchange-591a0a143df78cf5fa9d0ba4.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000-medicine-curl-press-591a0a2d5f9b58f4c09f9cfc.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000-medicine-knee-lifts-591a0b835f9b58f4c09fc4fe.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000-medicine-tricep-ext-591a0a495f9b58f4c09fa018.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000-medicine-squat-sweep-591a0b985f9b58f4c09fc70b.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000-medicine-squat-swing-591a0a973df78cf5fa9d1c0c.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000-medicine-squat-dribble-toss-591a0ab65f9b58f4c09faf66.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000-medicine-circle-squat-591a0a845f9b58f4c09fa81b.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000_medicinewoodcop-5919d5105f9b58f4c04dc318.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000-medicine-mod-woodchop-591a0b705f9b58f4c09fc31b.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000_medicinetoelunge-5919d58c3df78cf5fa4b2710.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000-medicine-knee-pullss-591a0ad63df78cf5fa9d235a.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000-medicine-pull-over-591a0a705f9b58f4c09fa518.gif)
:max_bytes(150000):strip_icc():format(webp)/Fitness_Gif-1500x1000-medicine-knee-roll-591a0a5c5f9b58f4c09fa21e.gif)