Python for loop completion

Question

I am a bit confused about how to put a for loop at the end of a line in python, for example

for i in x:
    print i

produces the expected result, but if I run

print i for i in x

I get a syntax error. Can someone explain a little more about how one goes about putting your loops at the end of a line like this.

Answer 1

In earlier versions of Python, the idea of ​​understanding lists was implemented to put together these two code templates:

# Go through each item in a list and run a test on them
# build a new list containing only items that pass the test

results = []
for item in somelist:
    if sometest(item):
        results.add(item)

and

# build a new list by changing every item in a list in the
# same way

results = []
for item in somelist:
    results.add(2 * item)

adding a new syntax that includes doing all three things in one - changing elements and / or testing them to include only some of the results and create a list of results:

results = [2 * item for item in somelist if sometest(item)]
# results is a list

[], "" Python, .

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, -, () [], :

somelist = [1,2,3,4,5]
results = (2 * item for item in somelist if sometest(item))
# results is a generator

, :

function((2 * item for item in somelist)) 

, :

function(2 * item for item in somelist)

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, :

>>> print (item for item in [1,2,3])
<generator object <genexpr> at 0x7fe31b8663c0>

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:

>>> print [item for item in [1,2,3]]
[1,2,3]

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Answer 2

. , , x for x in iter. a for , for x in iter genexp.

Python3 :

print(*(i for i in x))

@wim , "for loopy",

print(*(i for i in x), sep='\n')

, , xp, , , i**2 for i in x x, i for i in x if i%2 x ..

x, ( * *args ..) print

Answer 3

:

• - , , , , .
• Python 3, print from __future__ import print_function Python 2.x

, , for ... print i, :

[print(i) for i in x]

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Answer 4

x

Python.

( x)

[ x]

[print i for i in x]

print , .

Answer 5

, , python 2.x:

print '\n'.join(str(i) for i in x)

. for, , .

- , :

for i in x: print i

But it violates pep8, so I will not write such a line in a script.