Learning Python: The Ultimate Guide for Beginners to Coding with Python with Useful Tools

Modes for Opening a File in Python
Modes
Meaning
r
This  opens  a  file  for  reading
purposes  only.  The  default  mode  is
to  place  the  file  pointer  at  the
beginning of the file
r+
This opens a file for both writing and
reading.  Similar  to  the  r  mode,  the

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pointer is at the beginning of the file
rb
If  you  want  to  open  a  file  in  binary
format,  then  you  have  to  use  the  rb
mode.  Furthermore,  you  place  the
point at the starting point of the file
rb+
Open  files  for  both  writing  and
reading in binary format
w
Open files for writing purposes only.
if the file doesn’t exist, it will create
a new file, but if it does exist, it will
overwrite the file
wb
This  opens  a  file  for  writing  in
binary format. It also overwrites and
creates  new  files  depending  on  the
existence of the file
w+
This opens a file for both writing and
reading  purposes.  It  also  overwrites
and  creates  new  files  depending  on
the existence of the file.
wb+
Both  write  and  read  files  in  binary
format.  Overwrites  and  create  new
files  based  on  the  existence  of  the
file.
a
This  opens  a  file  for  appending.  If
the  file  exists,  the  pointer  is
positioned at the end of the file
a+
Opens  file  for  both  reading  and
appending purposes.
ab
Opens  file  for  appending  in  binary
format.
ab+
If you want to read and append files
in binary format, then the ab+ mode

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is  relevant.  If  the  file  exists,  the
pointer is positioned at the file end.

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Exercise to Try
Write  a  program,  which  requests  a  particular  user  to  insert  the
choice of their rental car. Print a message that displays the choice
of their rental car.
Write another program, which requests for a number and print if
the number is a multiple of 9 or not
Write a simple program that asks a user the number of a person
in a queue in a bank. If the user's reply is above 8, it should print
a  message  that  they  have  to  wait  or  go  home  and  return
tomorrow.