Pandas DataFrame中将True/False映射到1/0-编程知识

Pandas DataFrame中将True/False映射到1/0

在本文中，我们将看到如何在Pandas DataFrame中将True/False映射到1/0。True/False到1/0的转换在执行计算时至关重要，并且可以轻松分析数据。

1. replace方法

在这个例子中，我们使用Pandas replace()方法将True/False映射到1/0。在这里，我们创建了一个名为df的示例DataFrame，其中有两个列，‘Column 1’和’Column 2’，包含布尔值。然后，我们在DataFrame df上使用.replace()方法。我们提供了一个字典，其中我们指定True应该被替换为1，False应该被替换为0。

# Python code to map Boolean values to integer using .replace() method
import pandas as pd# Create a sample DataFrame with two columns, 'Column1' 
# and 'Column2', containing Boolean values
data = {'Column1': [True, False, True, False],'Column2': [False, True, False, True]}# Create a DataFrame named 'df' using the provided data
df = pd.DataFrame(data)# Print the original DataFrame 'df' containing Boolean values
print(df, '\n')# Use the .replace() method to map True/False to 1/0
df = df.replace({True: 1, False: 0})# Print the updated DataFrame 'df' where Boolean values 
# are now represented as integers (1/0)
print(df)

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2. applymap函数

在这个例子中，我们使用Pandas applymap()。在这里，创建包含布尔值的示例DataFrame df。然后，我们在DataFrame df上使用.applymap()函数。lambda函数lambda x：1 if x else 0按元素应用于DataFrame中的每个值。它检查x值是否为True，如果是，则返回1；否则返回0。

# Import the pandas library and alias it as 'pd'
import pandas as pd# Create a sample DataFrame with two columns, 
# 'Column1' and 'Column2', containing Boolean values
data = {'Column1': [True, False, True, False],'Column2': [False, True, False, True]}# Create a DataFrame named 'df' using the provided data
df = pd.DataFrame(data)# Print the original DataFrame 'df' containing Boolean values
print(df, '\n')# Use .applymap() with a lambda function to map True/False to 1/0
df = df.applymap(lambda x: 1 if x else 0)# Print the updated DataFrame 'df' where Boolean 
# values are now represented as integers (1/0)
print(df)

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3. astype方法

# Import the pandas library and alias it as 'pd'
import pandas as pd# Create a sample DataFrame with two columns, 'Column1' 
# and 'Column2', containing Boolean values
data = {'Column1': [True, False, True, False],'Column2': [False, True, False, True]}# Create a DataFrame named 'df' using the provided data
df = pd.DataFrame(data)# Print the original DataFrame 'df' containing Boolean values
print(df,'/n')# Convert the 'Column1' and 'Column2' columns from 
# Boolean (True/False) to integers (1/0)
df['Column1'] = df['Column1'].astype(int)
df['Column2'] = df['Column2'].astype(int)# Print the updated DataFrame 'df' where Boolean 
# values are now represented as integers
print(df)

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4. apply和lambda函数

# Import the pandas library and alias it as 'pd'
import pandas as pd# Create a sample DataFrame with two columns, 'Column1' 
# and 'Column2', containing Boolean values
data = {'Column1': [True, False, True, False],'Column2': [False, True, False, True]}# Create a DataFrame named 'df' using the provided data
df = pd.DataFrame(data)
print(df,"\n")# We define a lambda function that converts True to 1 and False 
# to 0 and apply it to each column using .apply()
df_apply = df.apply(lambda x: x.apply(lambda y: 1 if y else 0))# Print the DataFrame 'df_apply' with the mapping applied 
# using .apply() and a lambda function
print("\nUsing .apply() method with lambda function:")
print(df_apply)

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5. map方法

# Import the pandas library and alias it as 'pd'
import pandas as pd# Create a sample DataFrame with two columns, 'Column1' and 
# 'Column2', containing Boolean values
data = {'Column1': [True, False, True, False],'Column2': [False, True, False, True]}# Create a DataFrame named 'df' using the provided data
df = pd.DataFrame(data)
print(df,"\n")# We use .map() on a specific column and provide a dictionary to perform the mapping
df['Column1'] = df['Column1'].map({True: 1, False: 0})# Print the updated 'Column1' in the original DataFrame 
# 'df' where Boolean values are mapped to integers
print("\nUsing .map() method for 'Column1':")
print(df)