Python 我无法打印函数外部的fi值

返回fi

或 使fi成为可以从任何地方访问的全局变量

s= input("enter the string to be checked") 
def pig(s): 
    first=s[0] 
    if first in "aeoui": fi=s + "ay" 
    else: fi=s[1:]+first+"ay"
    return fi
fi = pig(s)
print(fi)

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您应该了解什么是全局变量isglobal可以说是最糟糕的解决方案之一，特别是对于初学者，我建议在返回不合适时使用简单的OOP原则

s= input("enter the string to be checked") 
def pig(s): 
    first=s[0] 
    if first in "aeoui": fi=s + "ay" 
    else: fi=s[1:]+first+"ay"
    return fi
fi = pig(s)
print(fi)

s= input("enter the string to be checked") 
def pig(s): 
    global fi
    first=s[0] 
    if first in "aeoui": fi=s + "ay" 
    else: fi=s[1:]+first+"ay"
pig(s)
print(fi)