๐ฆ๐ฏ๐ฒ๐ฟ๐ฑ๐ฌ๐ฌ ๐๐ฎ๐๐ฐ๐ต ๐ณ โ ๐๐ฟ๐ฒ๐ฒ ๐๐ฐ๐ฐ๐ฒ๐น๐ฒ๐ฟ๐ฎ๐๐ผ๐ฟ ๐ณ๐ผ๐ฟ ๐๐ & ๐๐ฒ๐ฒ๐ฝ๐ง๐ฒ๐ฐ๐ต ๐ฆ๐๐ฎ๐ฟ๐๐๐ฝ๐ ๐
Ready to scale your startup beyond local market?
Who should apply:
โ Startups with MVP and early traction
โ DeepTech: GenAI, robotics, advanced materials, photonics, quantum computing
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โ International founders exploring the Russian market
What you'll get:
๐ 12-week online program in English
๐ International mentors (Europe, US, Asia, Middle East)
๐ Access to investors & corporate customers
๐ Demo Day at Moscow Startup Summit (Fall 2026)
Results:
๐ Revenue grows 4x on average, up to 1,000x for some teams
๐ค 10,900+ contracts and pilots with corporations (6 seasons)
Program stages:
1๏ธโฃ Online bootcamp for 150 teams
2๏ธโฃ 25 best teams โ intensive mentorship
3๏ธโฃ Demo Day presentation
Key details:
๐ Deadline: 10 April 2026
๐ฐ Participation: Free of charge
๐ Format: Online
๐ฌ Language: English
๐๐ฝ๐ฝ๐น๐ ๐ก๐ผ๐ ๐
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๐ฅ Don't wait. Scale your startup with Sber500.
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Ready to scale your startup beyond local market?
Who should apply:
โ Startups with MVP and early traction
โ DeepTech: GenAI, robotics, advanced materials, photonics, quantum computing
โ Applied AI for research, Earth remote sensing, autonomous transport
โ International founders exploring the Russian market
What you'll get:
๐ 12-week online program in English
๐ International mentors (Europe, US, Asia, Middle East)
๐ Access to investors & corporate customers
๐ Demo Day at Moscow Startup Summit (Fall 2026)
Results:
๐ Revenue grows 4x on average, up to 1,000x for some teams
๐ค 10,900+ contracts and pilots with corporations (6 seasons)
Program stages:
1๏ธโฃ Online bootcamp for 150 teams
2๏ธโฃ 25 best teams โ intensive mentorship
3๏ธโฃ Demo Day presentation
Key details:
๐ Deadline: 10 April 2026
๐ฐ Participation: Free of charge
๐ Format: Online
๐ฌ Language: English
๐๐ฝ๐ฝ๐น๐ ๐ก๐ผ๐ ๐
https://sberbank-500.ru/
๐ฅ Don't wait. Scale your startup with Sber500.
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โ
Data Cleaning in Pandas ๐๐งน
๐ In real projects, 80% of the work = Data Cleaning
Because raw data is always messy ๐
๐น 1. Why Data Cleaning?
Real-world data may have:
โ Missing values
โ Duplicate records
โ Wrong formats
โ Extra spaces
๐ Cleaning makes data usable for analysis & ML.
๐ฅ 2. Handling Missing Values
โ Check Missing Values
df.isnull()
df.isnull().sum()
โ Remove Missing Values
df.dropna()
โ Fill Missing Values
df.fillna(0)
๐ Replace missing values with 0 or mean.
๐น 3. Remove Duplicates
df.drop_duplicates()
๐น 4. Rename Columns
df.rename(columns={"Name": "Full_Name"}, inplace=True)
๐น 5. Change Data Types
df["Age"] = df["Age"].astype(int)
๐น 6. Remove Extra Spaces
df["Name"] = df["Name"].str.strip()
๐น 7. Replace Values
df["City"] = df["City"].replace("NY", "New York")
๐น 8. Why This is Important?
โ Clean data = better insights
โ Clean data = better ML models
โ Used in every real-world project
๐ฏ Todayโs Goal
โ Handle missing values
โ Remove duplicates
โ Fix data types
โ Clean text data
๐ Double Tap โค๏ธ For More
๐ In real projects, 80% of the work = Data Cleaning
Because raw data is always messy ๐
๐น 1. Why Data Cleaning?
Real-world data may have:
โ Missing values
โ Duplicate records
โ Wrong formats
โ Extra spaces
๐ Cleaning makes data usable for analysis & ML.
๐ฅ 2. Handling Missing Values
โ Check Missing Values
df.isnull()
df.isnull().sum()
โ Remove Missing Values
df.dropna()
โ Fill Missing Values
df.fillna(0)
๐ Replace missing values with 0 or mean.
๐น 3. Remove Duplicates
df.drop_duplicates()
๐น 4. Rename Columns
df.rename(columns={"Name": "Full_Name"}, inplace=True)
๐น 5. Change Data Types
df["Age"] = df["Age"].astype(int)
๐น 6. Remove Extra Spaces
df["Name"] = df["Name"].str.strip()
๐น 7. Replace Values
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๐น 8. Why This is Important?
โ Clean data = better insights
โ Clean data = better ML models
โ Used in every real-world project
๐ฏ Todayโs Goal
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โค4๐1
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โ
Data Science Interview Prep Guide ๐๐ง
Whether you're a fresher or career-switcher, hereโs how to prep step-by-step:
1๏ธโฃ Understand the Role
Data scientists solve problems using data. Core responsibilities:
โข Data cleaning & analysis
โข Building predictive models
โข Communicating insights
โข Working with business/product teams
2๏ธโฃ Core Skills Needed
โ๏ธ Python (NumPy, Pandas, Matplotlib, Scikit-learn)
โ๏ธ SQL
โ๏ธ Statistics & probability
โ๏ธ Machine Learning basics
โ๏ธ Data storytelling & visualization (Power BI / Tableau / Seaborn)
3๏ธโฃ Key Interview Areas
A. Python & Coding
โข Write code to clean and analyze data
โข Solve logic problems (e.g., reverse a list, group data by key)
โข List vs Dict vs DataFrame usage
B. Statistics & Probability
โข Hypothesis testing
โข p-values, confidence intervals
โข Normal distribution, sampling
C. Machine Learning Concepts
โข Supervised vs unsupervised learning
โข Overfitting, regularization, cross-validation
โข Algorithms: Linear Regression, Decision Trees, KNN, SVM
D. SQL
โข Joins, GROUP BY, subqueries
โข Window functions
โข Data aggregation and filtering
E. Business & Communication
โข Explain model results to non-tech stakeholders
โข What metrics would you track for [business case]?
โข Tell me about a time you used data to influence a decision
4๏ธโฃ Build Your Portfolio
โ Do projects like:
โข E-commerce sales analysis
โข Customer churn prediction
โข Movie recommendation system
โ Host on GitHub or Kaggle
โ Add visual dashboards and insights
5๏ธโฃ Practice Platforms
โข LeetCode (SQL, Python)
โข HackerRank
โข StrataScratch (SQL case studies)
โข Kaggle (competitions & notebooks)
๐ฌ Tap โค๏ธ for more!
Whether you're a fresher or career-switcher, hereโs how to prep step-by-step:
1๏ธโฃ Understand the Role
Data scientists solve problems using data. Core responsibilities:
โข Data cleaning & analysis
โข Building predictive models
โข Communicating insights
โข Working with business/product teams
2๏ธโฃ Core Skills Needed
โ๏ธ Python (NumPy, Pandas, Matplotlib, Scikit-learn)
โ๏ธ SQL
โ๏ธ Statistics & probability
โ๏ธ Machine Learning basics
โ๏ธ Data storytelling & visualization (Power BI / Tableau / Seaborn)
3๏ธโฃ Key Interview Areas
A. Python & Coding
โข Write code to clean and analyze data
โข Solve logic problems (e.g., reverse a list, group data by key)
โข List vs Dict vs DataFrame usage
B. Statistics & Probability
โข Hypothesis testing
โข p-values, confidence intervals
โข Normal distribution, sampling
C. Machine Learning Concepts
โข Supervised vs unsupervised learning
โข Overfitting, regularization, cross-validation
โข Algorithms: Linear Regression, Decision Trees, KNN, SVM
D. SQL
โข Joins, GROUP BY, subqueries
โข Window functions
โข Data aggregation and filtering
E. Business & Communication
โข Explain model results to non-tech stakeholders
โข What metrics would you track for [business case]?
โข Tell me about a time you used data to influence a decision
4๏ธโฃ Build Your Portfolio
โ Do projects like:
โข E-commerce sales analysis
โข Customer churn prediction
โข Movie recommendation system
โ Host on GitHub or Kaggle
โ Add visual dashboards and insights
5๏ธโฃ Practice Platforms
โข LeetCode (SQL, Python)
โข HackerRank
โข StrataScratch (SQL case studies)
โข Kaggle (competitions & notebooks)
๐ฌ Tap โค๏ธ for more!
โค14๐1
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โค2๐1
Which library is used for basic plotting in Python?
Anonymous Quiz
7%
A) NumPy
10%
B) Pandas
79%
C) Matplotlib
3%
D) TensorFlow
โค1
Which function is used to display a plot?
Anonymous Quiz
8%
A) showplot()
4%
B) display()
66%
C) plt.show()
22%
D) plot.show()
โค1
What type of chart is best for showing trends over time?
Anonymous Quiz
11%
A) Bar chart
8%
B) Pie chart
68%
C) Line chart
13%
D) Histogram
โค2
Which library is used for advanced and attractive visualizations?
Anonymous Quiz
21%
A) Matplotlib
67%
B) Seaborn
7%
C) NumPy
5%
D) SciPy
โค2
What does a histogram show?
Anonymous Quiz
36%
A) Relationship between two variables
7%
B) Categories
55%
C) Distribution of data
1%
D) Exact values
โค2