从raw_input打印时随机无 [英] Random None when printing from raw_input

问题描述

我是编码的新手，我最近制作了十进制到二进制"和二进制到十进制"转换器，并且我希望raw_input的文本像打字机一样一次打出一个字母，但之后却要输入None之所以完成，是因为函数未返回任何内容.我不确定如何解决此问题，因为我希望raw_input是一个变量，并且尝试返回内容会给我带来语法错误.任何帮助表示赞赏.

I am new to coding I recently made a Decimal to Binary and Binary to Decimal Translator and I am wanting the text for the raw_input to type out one letter at a time like a typewriter, but I am getting after a None after it is done because function is not returning anything. I am not sure how to fix this because I want the raw_input to be a variable and trying to return things gives me syntax errors. Any help appreciated.

import time
import sys
def type(string):
    for x in string:
        sys.stdout.write(x)
        sys.stdout.flush()
        time.sleep(.01)

dbbd = raw_input(type('Type "db" for decimal to binary, Type "bd" for binary to decimal.'))

这是重要的部分^

有兴趣的人可以使用的完整程序: http://pastebin.com/GPw81Mi5

full program for anyone interested: http://pastebin.com/GPw81Mi5

推荐答案

raw_input需要一个字符串作为输入

raw_input expects a string as input

>>> help(raw_input)

您可以做的是先打印您的提示字符串，然后要求用户输入.

What you could do is the first print your prompt string and then ask for the input from the user.

import time
import sys
def typewriter(string):
    for x in string:
        sys.stdout.write(x)
        sys.stdout.flush()
        time.sleep(.01)
typewriter('Type "db" for decimal to binary, Type "bd" for binary to decimal: ')
dbbd = raw_input()

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