if 块的第一个条件被跳过

Posted 2023-02-23

【中文标题】if 块的第一个条件被跳过

【英文标题】：First condition of an if-block is getting skipped

【发布时间】：2020-09-29 07:05:40

【问题描述】：

我正在使用 Python 2.7 编写代码来检查输入字符串中是否存在字符，但 Python 一直在跳过我的部分 if 语句。

每次我运行代码并输入一个guess 字符值时，都会直接执行else 语句，并且根本不会执行if(guess in PuzzleSetter) == True 块。

我做错了什么？

    PuzzleSetter = " "
List = []
def setPuzzle():
    PuzzleSetter = raw_input("Puzzle setter set your word: ")
    PuzzleSetter = PuzzleSetter.replace(" ", "")
    print("Guessing player try guessing: "+PuzzleSetter.upper())
    time.sleep(5)
    print(chr(27) + "[2J")
    List = [' __ ']*len(PuzzleSetter)
    print("\n")
    print(List)

    while(True):
        guess = raw_input("\nGuessing player make your guess: ")
        if len(guess) != 1:
            print("You are meant to enter a single letter")
            continue
        else:
            guess = guess.upper()
            print(guess)
            if(guess in PuzzleSetter) == True:
                finder = PuzzleSetter.find(guess)
                print(PuzzleSetter+" contains "+str(PuzzleSetter.count(guess))+" "+guess+"'s")
                for count in range(PuzzleSetter.count(guess)):
                    List[finder] = guess.upper()
                    finder = PuzzleSetter.find(guess, finder+1)
                print(List)
                if List.count("__") == 0:
                    print("Guessing player wins!")
                    break
            else:
                HangerMan()
                enter += 1
                if enter == 7:
                    print("Guessing player lost!")
                    print("\nPlayer two becomes the puzzle setter")
                    setPuzzle()

【问题讨论】：

什么是 PuzzleSetter？

PuzzleSetter 是如何定义的？我看到它会被跳过的唯一原因基本上是如果guess 不在PuzzleSetter 中。如果 PuzzleSetter（似乎不是列表）无法处理 in 检查，则此行将始终评估为 False 并跳转到 else 块。强烈建议您也发布PuzzleSetter 的定义。

请edit您的问题并提供问题的minimal reproducible example。

关于风格的快速说明：== True 是多余的，最好省略。

如果PuzzleSetter只包含小写字母，则永远不会在其中找到已转换为大写的guess。

【参考方案1】：

正如我所想，您将PuzzleSetter 作为输入，而不是像guess 那样将其转换为大写。如果它包含任何小写字母，它们将永远找不到。试试这个：

PuzzleSetter = raw_input("Puzzle setter set your word: ")
PuzzleSetter = PuzzleSetter.replace(" ", "")
PuzzleSetter = PuzzleSetter.upper()
print("Guessing player try guessing: "+PuzzleSetter)