Cumsum as a new column in an existing Pandas dataframe

Cumsum as a new column in an existing Pandas dataframe

You can calculate the cumulative sum (cumsum) of a specific column in a Pandas DataFrame and add it as a new column. You can use the .cumsum() method on the column and then assign the result to a new column in the DataFrame.

Here's an example:

import pandas as pd

# Create a sample DataFrame
data = {'Value': [10, 20, 30, 40, 50]}
df = pd.DataFrame(data)

# Calculate and add the cumulative sum as a new column
df['CumulativeSum'] = df['Value'].cumsum()

print(df)

In this example, the .cumsum() method is applied to the "Value" column to calculate the cumulative sum, and then the result is assigned to a new column named "CumulativeSum" in the DataFrame.

The resulting DataFrame will have an additional column "CumulativeSum" containing the cumulative sum values.

Remember to replace "Value" with the actual column name you want to compute the cumulative sum for.

Examples

  1. "Pandas cumsum new column" Description: Users may search for how to add a cumulative sum as a new column in a Pandas DataFrame. Code:

    import pandas as pd

# Create a sample DataFrame
df = pd.DataFrame({'A': [1, 2, 3, 4, 5]})

# Add a new column with cumulative sum
df['Cumulative_Sum'] = df['A'].cumsum()

print(df)

  2. "How to append cumsum to Pandas DataFrame" Description: This query indicates the need to append the cumulative sum as a new column to an existing Pandas DataFrame. Code:

    import pandas as pd

# Assuming 'df' is your existing DataFrame
df['Cumulative_Sum'] = df['Your_Column_Name'].cumsum()

print(df)

  3. "Pandas cumulative sum as new column" Description: Users may search for how to compute a cumulative sum and add it as a new column using Pandas. Code:

    import pandas as pd

# Assuming 'df' is your DataFrame and 'column_name' is the column you want to perform cumsum on
df['Cumulative_Sum'] = df['column_name'].cumsum()

print(df)

  4. "Python Pandas add cumsum column" Description: This query is about adding a cumulative sum as a new column using Pandas in Python. Code:

    import pandas as pd

# Assuming 'df' is your DataFrame and 'column' is the column you want to perform cumsum on
df['Cumulative_Sum'] = df['column'].cumsum()

print(df)

  5. "How to create cumulative sum column in Pandas" Description: Users may seek information on how to create a cumulative sum column in a Pandas DataFrame. Code:

    import pandas as pd

# Assuming 'df' is your DataFrame and 'col' is the column you want to perform cumsum on
df['Cumulative_Sum'] = df['col'].cumsum()

print(df)

  6. "Python Pandas cumsum column" Description: This query refers to the process of calculating the cumulative sum and adding it as a new column in Pandas using Python. Code:

    import pandas as pd

# Assuming 'df' is your DataFrame and 'column_name' is the column you want to perform cumsum on
df['Cumulative_Sum'] = df['column_name'].cumsum()

print(df)

  7. "Cumulative sum in Pandas DataFrame" Description: Users might search for information on how to compute a cumulative sum in a Pandas DataFrame. Code:

    import pandas as pd

# Assuming 'df' is your DataFrame and 'column' is the column you want to perform cumsum on
df['Cumulative_Sum'] = df['column'].cumsum()

print(df)

  8. "Adding cumulative sum as new column Pandas" Description: This query reflects the intention to add a cumulative sum as a new column in a Pandas DataFrame. Code:

    import pandas as pd

# Assuming 'df' is your DataFrame and 'column_name' is the column you want to perform cumsum on
df['Cumulative_Sum'] = df['column_name'].cumsum()

print(df)

  9. "Python Pandas cumulative sum new column" Description: Users might search for Python Pandas code snippets to compute a cumulative sum and append it as a new column. Code:

    import pandas as pd

# Assuming 'df' is your DataFrame and 'col_name' is the column you want to perform cumsum on
df['Cumulative_Sum'] = df['col_name'].cumsum()

print(df)

  10. "How to update existing Pandas DataFrame with cumsum" Description: This query suggests the user wants to know how to update an existing Pandas DataFrame with a cumulative sum. Code:

    import pandas as pd

# Assuming 'df' is your existing DataFrame and 'column_name' is the column you want to perform cumsum on
df['Cumulative_Sum'] = df['column_name'].cumsum()

print(df)

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