我还在学习python，我不明白为什么我会把它当成一个错误
我还在学习python，我不明白为什么我会把它当成一个错误
提问于 2022-09-30 02:31:51
print("Calculator!!!")
loop = 1
#title, obv
#basic inputs
numbercount = int(input("How many numbers are you doing math with? max is 3: "))
while loop == 1:
if numbercount == 1:
print("min characters are 2")
elif numbercount == 2:
mathtype = int(input("1. Addition\n2. Subtraction\n3. Multiplcation\n4. Division\n"))
if mathtype == 1:
print("format as\na = [number]\nb = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = a + b
print("Your awnser is: ", c)
elif mathtype == 2:
print("format as\na = [number]\nb = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = a - b
print("Your awnser is: ", c)
elif mathtype == 3:
print("format as\na = [number]\nb = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = a * b
print("Your awnser is: ", c)
elif mathtype == 4:
print("format as\na = [number]\nb = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = a / b
print("Your awnser is: ", c)
else:
print("try again")
if numbercount == 3:
mathtype = int(input("1. Addition\n2. Subtraction\n3. Multiplcation\n4. Division\n"))
if mathtype == 1:
print("format as\na = [number]\nb = [number]\nc = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = int(input("c = "))
d = a + b + c
print("Your awnser is: ", c)
elif mathtype == 2:
print("format as\na = [number]\nb = [number]\nc = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = int(input("c = "))
d = a - b - c
print("Your awnser is: ", c)
elif mathtype == 3:
print("format as\na = [number]\nb = [number]\nc = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = int(input("c = "))
d = a * b * c
print("Your awnser is: ", c)
elif mathtype == 4:
print("format as\na = [number]\nb = [number]\nc = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = int(input("c = "))
d = a / b / c
print("Your awnser is: ", c)
else:
print("try again")
else:
print("Max Characters is 3")错误信息:计算器！你在用多少个数字做数学？max为3: 3回溯(最近一次调用)：文件"main.py"，第13行，如果mathtype == 1: NameError: name 'mathtype‘未定义
我对python还是比较陌生的，我需要一些帮助:/除了为什么要使用python之外，还有什么会有帮助的。
回答 1
Stack Overflow用户
回答已采纳
发布于 2022-09-30 02:38:25
您在"elif“语句中定义了mathtype。这意味着如果if语句之前为true，那么elif语句中的代码将不会运行，这意味着整数类型将永远不会被定义。要解决这个问题，只需将第一个输入放入另一个while循环中，因此它将继续请求编号：
print("Calculator!!!")
loop = 1
#title, obv
#basic inputs
while loop == 1:
while True:
numbercount = int(input("How many numbers are you doing math with? max is 3: "))
if numbercount == 1:
print("min characters are 2")
else:
break
mathtype = int(input("1. Addition\n2. Subtraction\n3. Multiplcation\n4. Division\n"))
if mathtype == 1:
print("format as\na = [number]\nb = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = a + b
print("Your awnser is: ", c)
elif mathtype == 2:
print("format as\na = [number]\nb = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = a - b
print("Your awnser is: ", c)
elif mathtype == 3:
print("format as\na = [number]\nb = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = a * b
print("Your awnser is: ", c)
elif mathtype == 4:
print("format as\na = [number]\nb = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = a / b
print("Your awnser is: ", c)
else:
print("try again")
if numbercount == 3:
mathtype = int(input("1. Addition\n2. Subtraction\n3. Multiplcation\n4. Division\n"))
if mathtype == 1:
print("format as\na = [number]\nb = [number]\nc = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = int(input("c = "))
d = a + b + c
print("Your awnser is: ", c)
elif mathtype == 2:
print("format as\na = [number]\nb = [number]\nc = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = int(input("c = "))
d = a - b - c
print("Your awnser is: ", c)
elif mathtype == 3:
print("format as\na = [number]\nb = [number]\nc = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = int(input("c = "))
d = a * b * c
print("Your awnser is: ", c)
elif mathtype == 4:
print("format as\na = [number]\nb = [number]\nc = [number]\n\n")
a = int(input("a = "))
b = int(input("b = "))
c = int(input("c = "))
d = a / b / c
print("Your awnser is: ", c)
else:
print("try again")
else:
print("Max Characters is 3")页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/73903429
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