Question

# Validating for only numbers in python one after another(in sequence)

a = raw_input()

#if a is a number then it should take next raw_input i.e., 'b' else it should ask for 'a' again

b = raw_input()

#if b is a number then it should take next raw_input i.e., 'c' else it should ask for 'b' again

c = raw_input()

#if c is a number then it should take next raw_input i.e., 'd' else it should ask for 'c' again

## This should be done upto 'e'

Answer 1

使用a.isdigit()验证字符串a是否为数字

str.isdigit（）如果字符串中的所有字符都是数字且至少有一个字符，则返回true，否则返回false。

Answer 2

使用if..else构造进行条件检查，并将此post引用进行整数检查。

修改1

我还没有执行它，但您可以尝试以下操作，看看它是否有效 -

def ask(text):
    temp = raw_input(text)
    try:
        retVal = int(temp)
        return retVal
    except ValueError:
        return False

a = False
b = False
c = False

while not a:
    a = ask("Enter A:")
    if a == False:
        continue
    while not b:
        b = ask("ENter B:")
        if b == False:
            continue
        while not c:
            c = ask("Enter C:")

如何验证数字的python raw_input

2 个答案: