I'm wondering if there is a way in python to use a simplified, in-line for loop to do different things. For example:
for x in range(5):
print(x)
to be written in a simpler form, such as
print (x) for x in range(5)
but this does not seem to be working.
I've been googling for finding the right syntax for a couple hours without success. The only alternative I found is, when the in-line for loop is used to access elements of a list:
print ([x for x in range(5)])
is working, but it is doing something else, than what I'm looking for.
Can someone point to the right syntax or let me know if there are any restrictions? (maybe in-line for loops work only about lists?)
Quick answer:
There is no such a thing as "in line for loops" in python
A trick that works:
in python 3.*:
[print(x) for x in range(5)]
Because print is a function
In python 2.* printis not a function but you could define myprint and use it like this:
>>> def myprint(x):
... print x
...
>>> _=[ myprint(x) for x in range(5)]
0
1
2
3
4
More in depth:
What you call "in-line for loops" or "shortforms" are actually list comprehensions and (quoting documentation)
provide a concise way to create lists
The first part of a list comprehension (before the forkeyword) must contain an expression used to create list values. If your expression contains a function that has the (side) effect of printing something it works... but it is exactly a side effect. What you are really doing is creating a list and then discarding it.
Note that you can't assign values (like q += (x * y)) in a list comprehension because assignments are not expressions.
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