Script Slicing in Python

Question

I am new in programming and Python. I have a list in my hand and I want to manipulate my list as each words will be consisted of (first) 6 letters maximum.

Sample list as below.

 new_list = ['partiye', 'oy', 'vermeyecegimi', 'bilerek', 'sandiga', 'gidecegim']

I used below code for cutting the words.

 s = []
 a = []
 for i in range(len(new_list)):
      s = new_list[i]
      for j in new_list:
           a = s[:6]     
 print a

Each words consist of max 6 letters. The output of the code is "partiy oy vermey bilere sandig gidece".

But I could not assign my updated (cutted) words into a new list. Can someone advise me how can I do that ?

TerryA · Accepted Answer · 2015-06-06 11:56:25Z

3

This is where list comprehensions become really handy:

>>> new_list = ['partiye', 'oy', 'vermeyecegimi', 'bilerek', 'sandiga', 'gidecegim']
>>> print [i[:6] for i in new_list]
['partiy', 'oy', 'vermey', 'bilere', 'sandig', 'gidece']

If you wanted to expand it:

s = []
for i in new_list:
    s.append(i[:6])

It's pretty much the same approach as what you're doing, but it's a little neater.

What you're doing is continually re-assigning a to a value so it's rather pointless. I think you wanted a.append(s[:6]) anyway, which adds a value to a list, but even then that won't work since you're approaching the solution the wrong way :p.

answered Jun 6, 2015 at 11:56

TerryA

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3 Comments

Behzat Over a year ago

Terry, but the list is not updated. new_list is still as below isn't it ? I also want to update my list as each words will be max 6 letters. 'code' >>> new_list = ['partiye', 'oy', 'vermeyecegimi', 'bilerek', 'sandiga', 'gidecegim']

TerryA Over a year ago

@Behzat That's because the list comprehension does not override the list, you need to do that. This is easily obtained by doing new_list = [i[:6] for i in new_list]

Behzat Over a year ago

Many thanks Terry. That's what I try to do. It works very well.

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