Python Save to file

Question

I would like to save a string to a file with a python program named Failed py  Here is what I have so far   myFile   open  today   r    ips       for line in myFile      parts   line split          if parts 1      Failure           if parts 0  in ips              ips pars 0      1         else              ips parts 0     0  for ip in  k for k  v in ips iteritems   if v  gt  5        write to file called Failed py

User · Answer

In order to write into a file in Python  we need to open it in write w  append a or exclusive creation x mode  We need to be careful with the w mode  as it will overwrite into the file if it already exists  Due to this  all the previous data are erased  Writing a string or sequence of bytes  for binary files  is done using the write   method  This method returns the number of characters written to the file  with open  Failed py   w  encoding    utf-8   as f     f write  quot Write what you want to write in n quot      f write  quot this file n n quot    This program will create a new file named Failed py in the current directory if it does not exist  If it does exist  it is overwritten  We must include the newline characters ourselves to distinguish the different lines

User · Answer

You need to open the file again using open    but this time passing  w  to indicate that you want to write to the file  I would also recommend using with to ensure that the file will be closed when you are finished writing to it   with open  Failed txt    w   as f      for ip in  k for k  v in ips iteritems   if v  gt  5           f write ip    Naturally you may want to include newlines or other formatting in your output  but the basics are as above   The same issue with closing your file applies to the reading code  That should look like this   ips      with open  today   r   as myFile      for line in myFile          parts   line split              if parts 1      Failure               if parts 0  in ips                  ips pars 0      1             else                  ips parts 0     0

User · Answer

You can use this function  def saveListToFile listname  pathtosave       file1   open pathtosave  quot w quot        for i in listname          file1 writelines  quot    n quot  format i           file1 close       to save  saveListToFile list  path

User · Answer

file   open  Failed py    w   file write  whatever   file close     Here is a more pythonic version  which automatically closes the file  even if there was an exception in the wrapped block   with open  Failed py    w   as file      file write  whatever

User · Answer

myFile   open  today   r    ips       for line in myFile      parts   line split       if parts 1      Failure           ips setdefault parts 0   0          ips parts 0      1  of   open  failed py    w   for ip in  k for k  v in ips iteritems   if v  gt  5       of write k   n     Check out setdefault  it makes the code a little more legible   Then you dump your data with the file object s write method

[python] Python Save to file

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