Question

我讨厌提出重复的问题，但我整天都在研究和研究这个程序而没有太多运气。它应该在Cel中采取一定的温度。或远，以及英尺或米的高度，并告诉你在给定的高度，水是液体，气体还是固体形式（不考虑大气压力，我只是试图得到一个粗略的估计在高度上）。经验法则是，海水高度每隔300米（或1000英尺），水的沸度将比100摄氏度低1度。

我设法找到几种方法让它返回一个大致正确的数字。下一步是向程序添加错误检查。我尝试了一个'try'条款，但它没有发现错误，而对于我的生活，我无法弄清楚原因。

修改

我尝试了另一种方式，除了一个奇怪的问题之外，它可以捕捉错误。在两个函数inpALT（）和inpTEMP中输入输入时，它要求我输入两次输入，然后返回正确的值...：

def inpALT():
    alt = str(input("Enter altitude above altlevel, format 100M/F :"))
    if re.match(r'[0-9]*[mMfF]$', alt):
        return alt
    else:
        raise ValueError("Invalid Format")     

def inpTEMP():
    temp = str(input("Tempurature in format 70C/F :"))
    if re.match(r'[0-9]*[cCfF]$', temp):
    return temp
    else:
        raise ValueError("Invalid Format")


while True:
    try:
        inpALT()
        break
    except ValueError:("Invalid Format")      

while True:
    try:
        inpTEMP()
        break
    except ValueError:("Invalid Format")

temp = inpTEMP()
alt = inpALT()

---- snip ----

但是，只有在我必须输入数据两次之后才会这样做：

输入高于altlevel的海拔高度，格式为100M / F：100F

以70C / F格式输入温度：100F

以70C / F格式输入温度：100F

输入高于altlevel的海拔高度，格式为100M / F：100F

为什么会这样做？？

Answer 1

这是您在评论中获得的帮助的摘要。我为您提供了针对您的具体问题的更正代码。我对它进行了评论，所以我希望通过自己阅读和实现它可以帮助很多。

我试图让您了解在while loop内重新构建代码的想法。我不推荐提供的代码，但这不是重点。我不想太打破你的编码风格。我专注于你提供的第二个代码。对我来说，我不清楚我必须去哪里。

#!/usr/bin/env/python
# -*- coding: utf-8 -*-

"""corrected version with more PEP8 included."""

import re
import sys  # just for exit the script. There are multiple other ways.

# the assignments will be done later, no need for that here.
# alt = ""
# temp = ""


# readable names are better than cryptic ones
def get_altitude():
    alt = str(input("Enter altitude above sealevel, format 100M/F: "))

    # after `return` code will not be executed. You have to do it before the
    # return statement as mentioned by jojonas. Maybe you will also allow a
    # minus at the beginning and disallow no numbers (+ instead of *)?
    if not re.match(r'[0-9]*[mMfF]$', alt):
        raise ValueError

    return alt


# readable names are better than cryptic ones
def get_temperature():
    temp = str(input("Tempurature in format 70C/F: "))

    # the same here with the return statement
    if not re.match(r'[0-9]*[cCfF]$', temp):
        raise ValueError

    return temp


# The while loop stands for: do it forever. Maybe this is not what you want?!
# The user has to give a wrong input format (then sys.exit is your friend as
# one example of stopping the script or the user has to manually stop the
# script (STRG+C) or something like that. There are better ways.
while True:
    try:
        # you need to assign the returned values to a variable as mentioned
        # by jojonas already. Here is the way of doing it.
        alt = get_altitude()
        temp = get_temperature()

    # slight change in catching the error
    except ValueError:
        print('Invalid input format!')
        sys.exit(1)

    # finally will be done after exception occured! If you don't use
    # sys.exit (as I did as a fast hack not to totally disorder your
    # program), you have to be careful about this solution.
    finally:
        t = ''.join(x for x in temp if x.isdigit())
        a = ''.join(x for x in alt if x.isdigit())

        t = int(t)
        a = int(a)

        if "F" in temp:
            # just another way of expressing the same:
            t -= 32 / 1.8

        if "F" in alt:
            # just another way of expressing the same:
            a /= 3.3

        tPoint = 100 - a * 0.00552

        # just another way of expressing the same:
        if 0 - (int(tPoint)) < a < (100 - (int(tPoint))):
            print("Liquid")

        if a < (0 - int(tPoint)):
            print("Solid")

        if a > (100 - int(tPoint)):
            print("Gas")

我希望这会对你有所帮助。请问是否还有不清楚的事情。

回归＆amp;在Python中调用函数外部函数...这里有什么错误？

1 个答案: