File handling

Read files

To open the file, use the built-in open() function. The open() function returns a file object, which has a read() or readline() method for reading the content of the file:

line = open("demofile.txt").readlines()
for line in file:
    line = line.strip()
    print(line)

Write to an Existing File

To write to an existing file, we must open the existing file first using open() function:

Arguments	usage
“a”	will append to the end of the file
“w”	will overwrite any existing content
“x”	will create a file, returns an error if the file exist

f = open("demofile2.txt", "a")
f.write("Now the file has more content!")
f.close()

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

'''By default the read() method returns the whole text, but you can also specify
how many characters you want to return'''

#read(5)

Create a New File

f = open("myfile.txt", "x")
f.write("Hello World!")
f.close()

Delete a File

To delete a file, you must import the OS module, and run its os.remove() function.

import os
if os.path.exists("demofile.txt"):
  os.remove("demofile.txt")
else:
  print("The file does not exist")

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