Python File Methods

close()

• Closes the file

  f = open("demofile.txt", "r")
  print(f.read())
  f.close()
  

detach()

• Returns the separated raw stream from the buffer

  f = open("demofile.txt", "r")
  print(f.detach())
  

fileno()

• Returns a number that represents the stream, from the operating system’s perspective

  f = open("demofile.txt", "r")
  print(f.fileno())
  

flush()

• Flushes the internal buffer

  f = open("myfile.txt", "a")
  f.write("Now the file has one more line!")
  f.flush()
  f.write("...and another one!")
  

isatty()

• Returns whether the file stream is interactive or not

  f = open("demofile.txt", "r")
  print(f.isatty())
  

read()

• Returns the file content

  f = open("demofile.txt", "r")
  print(f.read())
  

readable()

• Returns whether the file stream can be read or not

  f = open("demofile.txt", "r")
  print(f.readable())
  

readline()

• Returns one line from the file

  f = open("demofile.txt", "r")
  print(f.readline())
  

readlines()

• Returns a list of lines from the file

  f = open("demofile.txt", "r")
  print(f.readlines())
  

seek()

• Change the file position

f = open("demofile.txt", "r")
f.seek(4)
print(f.readline())

seekable()

• Returns whether the file allows us to change the file position

f = open("demofile.txt", "r")
print(f.seekable())

tell()

• Returns the current file position

f = open("demofile.txt", "r")
print(f.tell())

truncate()

• Resizes the file to a specified size

f = open("demofile2.txt", "a")
f.truncate(20)
f.close()

#open and read the file after the truncate:
f = open("demofile2.txt", "r")
print(f.read())

writable()

• Returns whether the file can be written or not

f = open("demofile.txt", "a")
print(f.writable())

write()

• Writes the specified string to the file

f = open("demofile2.txt", "a")
f.write("See you soon!")
f.close()

#open and read the file after the appending:
f = open("demofile2.txt", "r")
print(f.read())

writelines()

• Writes a list of strings to the file

  f = open("demofile3.txt", "a")
  f.writelines(["See you soon!", "Over and out."])
  f.close()
  
  #open and read the file after the appending:
  f = open("demofile3.txt", "r")
  print(f.read())