On 22/08/18 07:46, Rafael Knuth wrote:
> import pandas as pd
> cities_lst = pd.read_table("cool_cities.csv")
> cities_lst.head()
>
> I was trying to rewrite the above as a function.
> Unlike my code above, my function below did not return the first 5
> rows, but just nothing:
>
> def cities(file_name):
> import pandas as pd
> cities_lst = pd.read_table(file_name)
> cities_lst.head()
>
> cities("cool_cities.csv")
>
> Why does my function not return the first 5 rows?
> What's the mistake I am making here?
You are not returning anything.
You need to use the return keyword otherwise your
function just generates the data internally then
throws it away again.
def double(x):
value = x * 2 # no return statement
def treble(x):
value = x * 3
return value
print(double(4)) -> None
print(treble(4)) -> 12
HTH
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
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