如何在python中检查raw_input是否为整数,字符串和日期

datetime.datetime.strptime()ValueError如果字符串与格式不匹配,则会引发.

raw_input()总是返回字符串对象,所以isinstance(data1, int)总是False如果你data1在检查之前没有转换为int对象.

我建议使用try...except捕捉到ValueError类似下面的代码:

import datetime

data1 = raw_input("data = ")
print(data1)

try:
    datetime.datetime.strptime(data1, '%Y-%m-%d')

except ValueError:

    try:
        int(data1)

    except ValueError:
        print("str it is")

    else:
        print("int it is")
else:
    print("date it is")

演示:

kevin@Arch ~> python2 input_check.py 
data = 2014-01-02
2014-01-02
date it is

kevin@Arch ~> python2 input_check.py 
data = 12
12
int it is

kevin@Arch ~> python2 input_check.py 
data = foobar
foobar
str it is