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
– user3378649, Commented Feb 28, 2015 at 22:29

Paco Abato · Accepted Answer · 2015-02-28 22:28:23Z

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, 2015 at 22:28

Paco Abato

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6 Comments

user3378649 Over a year ago

phase should be a string ''.

volcano Over a year ago

The execution will not pass the loop unless h is defined

Paco Abato Over a year ago

Python is weak typed so phase can be initialized with a value of any type.

zehnpaard Over a year ago

I think you mean dynamically typed

volcano Over a year ago

What I meant is that there's mo need to define h before the loop - it is redundant

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