Python read in string from file and split it into values

Question

I have a file in the format below   995957 16833579 995959 16777241 995960 16829368 995961 50431654   I want to read in each line but split the values into the appropriate values  For example the first line would be split into   x   995957 y   16833579   Since its a string when you read it in and I want to convert them to an int and split them  how exactly would I go about doing this  Any help would be appreciated   Thanks

User · Accepted Answer

Something like this - for each line read into string variable a:

>>> a = "123,456"
>>> b = a.split(",")
>>> b
['123', '456']
>>> c = [int(e) for e in b]
>>> c
[123, 456]
>>> x, y = c
>>> x
123
>>> y
456

Now you can do what is necessary with x and y as assigned, which are integers.

User · Answer

I would do something like   filename    mynumbers txt  mynumbers      with open filename  as f      for line in f          mynumbers append  int n  for n in line strip   split        for pair in mynumbers      try          x y   pair 0  pair 1            Do Something with x and y     except IndexError          print  A line in the file doesn t have enough entries     The with open is recommended in http   docs python org tutorial inputoutput html since it makes sure files are closed correctly even if an exception is raised during the processing

User · Answer

gt  gt  gt    int i  for i in line strip   split       for line in open  input txt   readlines      995957  16833579    995959  16777241    995960  16829368    995961  50431654

User · Answer

Use open file  mode  for files   The mode is a variant of  r  for read   w  for write  and possibly  b  appended  e g    rb   to open binary files  See the link below   Use open with readline   or readlines    The former will return a line at a time  while the latter returns a list of the lines   Use split delimiter  to split on the comma   Lastly  you need to cast each item to an integer  int foo   You ll probably want to surround your cast with a try block followed by except ValueError as in the link below   You can also use  multiple assignment  to assign a and b at once    gt  gt  gt a  b   map int   2342342 2234234  split          gt  gt  gt print a   2342342  gt  gt  gt type a     lt type  int  gt    python io docs  python casting

[python] Python read in string from file and split it into values

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