CODEWITHSUNDEEP
pythonstring
prosseek
prosseek

Reputation: 190809

Concatenate strings read from file with python?

Emacs's auto-fill mode splits the line to make the document look nice. I need to join the strings read from the document.

For example, (CR is the carriage return, not the real character)

  - Blah, Blah, and (CR)
    Blah, Blah, Blah, (CR)
    Blah, Blah (CR)
  - A, B, C (CR) 
    Blah, Blah, Blah, (CR)
    Blah, Blah (CR)

is read into string buffer array with readlines() function to produce

["Blah, Blah, and Blah, Blah, Blah, Blah, Blah", "A, B, C Blah, Blah, Blah, Blah, Blah"]

I thought about having loop to check '-' to concatenate all the stored strings before it, but I expect Python has efficient way to do this.

ADDED:

Based on kindall's code, I could get what I want as follows.

lines = ["- We shift our gears toward nextGen effort"," contribute the work with nextGen."]
out = [(" " if line.startswith(" ") else "\n") + line.strip() for line in lines]
print out
res = ''.join(out).split('\n')[1:]
print res

The result is as follows.

['\n- We shift our gears toward nextGen effort', ' contribute the work with nextGen.']
['- We shift our gears toward nextGen effort contribute the work with nextGen.']

Upvotes: 2

Views: 10767

Answers (3)

inspectorG4dget
inspectorG4dget

Reputation: 113965

Use file.readlines(). It returns a list of strings, each string being a line of the file:

readlines(...)
    readlines([size]) -> list of strings, each a line from the file.

    Call readline() repeatedly and return a list of the lines so read.
    The optional size argument, if given, is an approximate bound on the
    total number of bytes in the lines returned.

EDIT: readlines() is not the best way to go, as has been pointed out in the comments. Disregard that suggestion and use the following one instead

If you were to use the output that emacs provides as input into a python function, then I would give you this (if the emacs output is one long string):

[s.replace("\n", "") for s in emacsOutput.split('-')]

Hope this helps

Upvotes: 0

kindall
kindall

Reputation: 184201

As I read it, your problem is to undo hard-wrapping and restore each set of indented lines to a single soft-wrapped line. This is one way to do it:

# hard-coded input, could also readlines() from a file
lines = ["- Blah, Blah, and", 
         "  Blah, Blah, Blah,",
         "  Blah, Blah",
         "- Blah, Blah, and",
         "  Blah, Blah, Blah,",
         "  Blah, Blah"]

out = [(" " if line.startswith(" ") else "\n") + line.strip() for line in lines]
out = ''.join(out)[1:].split('\n')

print out

Upvotes: 4

dugres
dugres

Reputation: 13095

I'm not sure if you want just :

result = thefile.read()

or maybe : 

result = ''.join(line.strip() for line in thefile)

or something else ...

Upvotes: 3

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