[英]How can i re-run a main() function in python, if one of its function throws an error?
這是一個程序,當以分數輸入時返回燃料百分比,其中輸入傳遞給另一個 function
def main():
# taking input from user 'x/y'
fuel = input("Fraction: ")
print(convert(fuel),"%",sep="")
def convert(fraction):
# extracting nominators
fraction.split('/')
x = int(fraction[0])
y = int(fraction[2])
# returning the percentage after calculating
try:
per = x / y * 100
return round(per)
# ignoring the errors
except ZeroDivisionError or ValueError:
pass
# re-run the main() function, if convert() throws errors
if __name__ == '__main__':
main()
當我編寫與此類似的整個代碼時,我得到了預期的結果:
def main():
while True:
try:
fuel = input("Fraction: ")
fuel.split('/')
x = int(fuel[0])
y = int(fuel[2])
print(round(x / y * 100),"%",sep="")
break
except ZeroDivisionError or ValueError:
pass
if __name__ == '__main__':
main()
但是我想將輸入( fuel )傳遞給另一個函數( convert() )。那么,如果它期望來自 convert(fraction) function 的 ZeroDivisionError 和 ValueError,我該如何再次重新運行 main() function?
一旦您從用戶那里獲得了有效輸入 - 即,您可以用百分比表示的內容,只需從 function 返回該值並根據需要將其傳遞給另一個。
是這樣的:
def convert(fraction):
pass
def main():
while True:
fraction = input('Fraction: ')
try:
a, b = map(float, fraction.split('/'))
print(f'{round(a/b*100)}%')
return fraction
except (ValueError, ZeroDivisionError):
print('Invalid input')
if __name__ == '__main__':
fraction = main()
convert(fraction)
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