python - while 循环中定义的变量无法定义

Question

我有一个像这样的 while 循环:

while True:
    try:
        h = int(raw_input("Please Enter your altitude in metres > "))
        if h > 0 and h < 11000:
            phase = 'Troposphere'
            break
    except ValueError:
            print 'Your entered value contained letters or punctuation. Please enter a numerical value.'

后来我想使用h和phase的值，但我的IDE告诉我它无法定义。这些值正在用于计算并打印相位。

Answer 1

在 while block 之外定义变量，以便可以在该 block 之外使用它们:

h = 0
phase = 0
while True:
    try:
        h = int(raw_input("Please Enter your altitude in metres > "))
        if h > 0 and h < 11000:
            phase = 'Troposphere'
            break
    except ValueError:
            print 'Your entered value contained letters or punctuation. Please enter a numerical value.'