Variable not defined in Python for-loop

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I have a problem in a code that should read 4 values using raw.input().split() and then a for-loop to turn such values into float. The interpreter returns to me:

"name 'val' is not defined"

Follows the code:

p=raw.input().split()
for i in range (0,4)
    val[i]=float(p[i])
python loop for variable-declaration

1 answer

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The code has some problems. As the auto-descriptive error presented by the compiler fails to declare the list val before using it.

Maybe it’s just a matter of version, but I used the function input() to run properly.

Missed the : at the end of the for.

This only works under very specific circumstances, which is not a problem for an exercise, but would be in actual application. It’s not the best way to do it yet but it works:

val = []
p = input('Digite uma sequência de números ').split()
for i in range(0, 4):
    val.append(float(p[i]))

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.

  • I had forgotten that the equivalent of vectors in python are lists. Thanks for the help beast!

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