向dataframe添加新列，并为每行添加唯一值

import pandas as pd
import numpy as np

df = pd.DataFrame()

unique_values = np.arange(len(df))

df['new_column'] = unique_values

import pandas as pd
import numpy as np

# 创建一个空的dataframe
df = pd.DataFrame()

# 生成唯一值的序列
unique_values = np.arange(len(df))

# 添加新列到dataframe
df['new_column'] = unique_values