displaying celsius in python- functions [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

using functions to display numbers in a list

x = [30,34,40,36,36,28,29,32,34,44,36,35,28,33,
     29,40,36,24,26,30,30,32,34,32,28,36,24,32]

def fahrenToCel(x):
    return (x - 32) * (5 / 9)


print fahrenToCel(x)

I know I have asked a couple of times, but I am still having issues. I just need to use a function to have that 开发者_开发技巧list of numbers displayed in celsius. This is the very last part I have to do, but I cannot figure it out. Please help

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x = [30,34,40,36,36,28,29,32,34,44,36,35,28,33,
     29,40,36,24,26,30,30,32,34,32,28,36,24,32]

def fahrenToCel(x):
    return (x - 32) * (5.0 / 9) # 5.0 to make result float (you can explicitly convert to float as well)


print [fahrenToCel(item) for item in x]

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Unless x is a numpy array, python will not know how to iterate over the values in x. You need to either loop over the values in x and pass each element to fahrenToCel() and place the returned value in a new list, or have fahrenToCel() take a list and do the loop internally and return a new list.

You might want to look at the following chapter of the python tutorial:

http://docs.python.org/tutorial/controlflow.html

Or search for other examples of how to iterate through lists.

Update For example:

def stupidfunc(y):
    return y 

a = [1,2,3,4,5]
b = [stupidfunc(x) for x in a]

or

def stupidfunc2(y):
    return [stupidfunc2(x) for x in y]

a = [1,2,3,4,5]
b = stupidfunc2(a)

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What about you'd use map(fahrenToCel, x) ?

x = [30,34,40,36,36,28,29,32,34,44,36,35,28,33, 29,40,36,24,26,30,30,32,34,32,28,36,24,32]

def fahrenToCel(f_temp):
    return (f_temp - 32) * (5.0/9)

celsius_list = map(fahrenToCel, x)

By the way, make sure you write 5.0/9 in your fahrenToCel function since 5/9 == 0

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Read about map function in python doc