python怎么回到上一步循环_如何返回上一个while循环？

尝试将第一个while循环嵌套在第二个while循环中。它将首先运行计算代码，检查是否要执行另一个计算，然后返回while True:循环的顶部执行另一个计算。在

像这样：while True:

x, y = raw_input("Enter 2 numbers separated by a space.").split()

answer = 0

#Enter the 2 numbers to be calculated.

print "You have selected, A = "+ x + " and B = " + y + "."

while int(y):

if (not int(y) % 2 == 0):

# this checks if y is even or odd

answer = int(answer) + int(x)

print "A = " + str(x) + " and B = " + str(y) + "."

print "B is odd so we'll add A to the total."

print "The running total is " + str(answer) + "."

else: (int(y) % 2 == 0)

print "A = " + str(x) + " and B = " + str(y) + "."

print "B is even, so we'll ignore that number."

x = int(x) * 2

y = int(y) / 2

print "The product is " + str(answer) + "."

a = raw_input("Would you like to make another calculation? Y or N")

if str(a) == "Y" or str(a) == "y":

continue

if str(a) == "N" or str(a) == "n":

print "Thank you have a nice day!"

break

else:

print "Invalid entry. Ending program."

break

希望有帮助

根据您正在尝试做什么，以及此特定代码在程序中出现的位置，通常建议将代码包装在函数内部。这样，当您导入模块时，它不会自动运行。你必须调用一个函数来运行代码。在

如果你想让它成为一个可执行的脚本，你应该把主循环代码包装在一个if __name__ == '__main__:块中，这样它只在直接执行时才执行。在

例如：

^{pr2}$

最后

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