Question

您好我是CS学生，目前非常新手我刚才有一个问题，我认为来自这个网站的许多python专家都能回答我的原始问题。

例如

def validNum(initialNum, endingNum):

    askNum = input("Please enter a number from initialNum to endingNum")

在main中：

    validNum(1, 31)

但在这种情况下，提示中的initialNum和endingNum是字符串，因此结果将是

"Please enter a number from initialNum to endingNum"

但我想要

"Please enter a number from 1 to 31"

有没有pythonic的方法来做到这一点？

Answer 1

您可以使用str.format()来完成您的任务，例如：

def validNum(initialNum, endingNum):
    askNum = input("Please enter a number from {0} to {1}: ".format(initialNum, endingNum))

validNum(1,31)

否则，您可以使用%和format specification mini-language获得相同的结果：

# if your input is a decimal:
askNum = input("Please enter a number from %d to %d: " % (initialNum, endingNum))

# if your input is a float:
askNum = input("Please enter a number from %f to %f: " % (initialNum, endingNum))

# or simply
askNum = input("Please enter a number from %r to %r: " % (initialNum, endingNum))

# or maybe
askNum = input("Please enter a number from %(initial)s to %(ending)s: " % {'initial': initialNum, 'ending': endingNum})

PS：看看printf-style String Formatting

Answer 2

在Python 3.6中，您只需要新的f-string：

def validNum(initialNum, endingNum):
    askNum = input(f"Please enter a number from {initialNum} to {endingNum}")

注意要插入的变量的前导f和花括号。

如何在python3.x中的输入语句中打印范围

2 个答案: