Python - Files

-1. Files Example

import datetime
import os
import shutil
import time
from os import path
from zipfile import ZipFile


def main1():
    # create a new file
    f = open("textfile.txt", "w+")

    # write file
    for i in range(10):
        f.write("This is line" + str(i) + "\r\n")

    f.close()

    # append in a file
    f = open("textfile.txt", "a")

    for i in range(10):
        f.write("This is added line" + str(i) + "\r\n")

    f.close()

    # open file for open
    f = open("textfile.txt", "r")
    if f.mode == 'r':
        # contents = f.read()
        # print(contents)

        fl = f.readlines()
        for x in fl:
            print(x)

    f.close()


def main2():
    # working with OS patch
    print(os.name)
    print(str(path.exists("textfile.txt")))
    print(str(path.isfile("textfile.txt")))
    print(str(path.isdir("textfile.txt")))
    print(str(path.realpath("textfile.txt")))
    print(str(path.split(path.realpath("textfile.txt"))))

    t = time.ctime(path.getmtime("textfile.txt"))
    print(t)

    print(datetime.datetime.fromtimestamp((path.getmtime("textfile.txt"))))

    td = datetime.datetime.now() - datetime.datetime.fromtimestamp(path.getmtime("textfile.txt"))
    print(str(td))
    print(str(td.total_seconds()) + " seconds")


def main3():
    # shell methods
    if path.exists("textfile.txt"):
        src = path.realpath("textfile.txt")
        dst = src + ".bak"
        shutil.copy(src, dst)
        shutil.copystat(src, dst)

        # os.rename("textfile.txt","textfile2.txt")

        # root_dir, tail=path.split(src)
        # shutil.make_archive("archive","zip",root_dir)

        with ZipFile("testzip.zip", "w") as newzip:
            print("===")
            newzip.write("textfile.txt")
            newzip.write("textfile.txt.bak")