This Python Write/Create Files lesson is for a beginner. Read the short notes, run each example, then change one name or number and run it again.
Mode \"w\" creates the file if it is missing and replaces it if it exists. write does not add a new line unless you include \n.
Mode \"x\" creates the file and fails if it already exists. Use that when overwriting would destroy work.
Example 1: Start here
On your machine, open the path with mode \"w\" inside a with block and call write.
lines = ["name=Meera\n", "city=Chennai\n"] # a list; the values stay in this order
print("".join(lines)) # join the pieces into one text
Example 2: Join what write would send
write does not add a newline unless you include it.
parts = ["name=Asha", "city=Chennai"] # a list; the values stay in this order
print("\n".join(parts) + "\n") # plus joins text; use str() for a number
Example 3: Append a line
Mode \"a\" on a real file adds to the end instead of replacing the file.
text = "name=Asha\n" # text
text += "city=Chennai\n" # update the stored value
print(text)
Example 4: Refuse to overwrite
Mode \"x\" raises an error when the file is already there. This check shows the same decision.
existing = {"notes.txt"} # a dictionary; each key has one value
name = "notes.txt" # text
if name in existing: # run the indented lines only when this is true
print("already exists")
On your machine, open the path with mode \"w\" inside a with block and call write.
