Variable defined in while loop cannot be defined

Question

I have a while loop like so:

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.'

and later I want to use the values for h and phase but my IDE is telling me it cannot be defined. The values are being used in a calculation and the phase is printed.

Do you want to store all the 'h'/phase values while looping, or just the last one ? — user3378649, Feb 28 '15 at 22:29

score 1 · Accepted Answer · answered Feb 28 '15 at 22:28

1

Define your variables outside the while block so they can be used outside such block:

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.'

answered Feb 28 '15 at 22:28

Paco Abato

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phase should be a string ''. – user3378649 Feb 28 '15 at 22:29
The execution will not pass the loop unless _h_ is defined – volcano Feb 28 '15 at 22:31
Python is weak typed so phase can be initialized with a value of any type. – Paco Abato Feb 28 '15 at 22:35
1

I think you mean [dynamically typed](http://stackoverflow.com/a/11328980/3155195) – zehnpaard Feb 28 '15 at 22:37
What I meant is that there's mo need to define _h_ before the loop - it is redundant – volcano Feb 28 '15 at 22:56
@volcano Yes, it is. Maybe a bug in the IDE? – Paco Abato Feb 28 '15 at 23:33

Variable defined in while loop cannot be defined

1 Answers1