DataFrame排序，单列排序，多列排序

import pandas as pd

# 创建示例 DataFrame
data = {
    'Name': ['Alice', 'Bob', 'Charlie'],
    'Age': [30, 25, 35],
    'Salary': [50000, 60000, 45000]
}
df = pd.DataFrame(data)

# 按照 'Age' 列升序排序
sorted_df = df.sort_values(by='Age', ascending=True)

print("Original DataFrame:")
print(df)

print("\nSorted DataFrame:")
print(sorted_df)

import pandas as pd

# 创建示例 DataFrame
data = {
    'Name': ['Alice', 'Bob', 'Charlie', 'David'],
    'Age': [30, 25, 35, 25],
    'Salary': [50000, 60000, 45000, 55000]
}
df = pd.DataFrame(data)

# 按照 'Age' 列升序，然后按照 'Salary' 列降序排序
sorted_df = df.sort_values(by=['Age', 'Salary'], ascending=[True, False])

print("Original DataFrame:")
print(df)

print("\nSorted DataFrame:")
print(sorted_df)