pandas之dataframe踩坑指南（一）---apply(func)

import pandas as pd
data = pd.read_csv(r"test数据.csv", engine="python",
                   encoding="utf-8")

def pprint(row):
    row["extra"]=1
    print(row)
    return row

data = data.apply(lambda x: pprint(x), axis=1)
print(data)

data = data.apply(lambda x: print(x), axis=1)

flag=False

def pprint(row):
    global flag

    if flag:
        row["extra"]=1
        print(row)
        else:
        flag=True
　　

    return row

data = data.apply(lambda x: pprint(x), axis=1) print(data)