File Handling-Day4.ipynb

Kernel: Python 3

## Time Module:
from time import time, ctime
t = time()
ctime(t)## for current time

import time
current_local = time.localtime()
current_local.tm_zone

import time
a=time.strftime('%m-%y-%d', time.localtime())

t = time.strftime("%d/%m/%y|%H:%M:%S")
print (a)
print(t)

09-20-16
16/09/20|13:47:30

print(time.strftime("%y/%m/%d|%H:%M:%S"))

20/09/16|13:53:22

Tstr=time.strftime("%A/%B|%a/%b") # Day|MONTH
print(Tstr)
tstr=time.strftime("%H:%M:%p")# Current time IN AM/PM
print(tstr)
w=time.strftime("%z")
print(w)

Wednesday/September|Wed/Sep
13:57:PM
+0530

530

import datetime 
print("Current date and time: " , datetime.datetime.now())
print("Current year: ", datetime.date.today().strftime("%Y"))
print("Month of year: ", datetime.date.today().strftime("%B"))#%b
print("Week number of the year: ", datetime.date.today().strftime("%W"))
print("Weekday of the week: ", datetime.date.today().strftime("%w"))
print("Day of year: ", datetime.date.today().strftime("%j"))
print("Day of the month : ", datetime.date.today().strftime("%d"))
print("Day of week: ", datetime.date.today().strftime("%A"))

Current date and time:  2020-09-16 13:50:32.358677
Current year:  2020
Month of year:  September
Week number of the year:  37
Weekday of the week:  3
Day of year:  260
Day of the month :  16
Day of week:  Wednesday

from time import strftime, localtime
print(strftime('%c', localtime()))
time.sleep(10)
print(strftime('%c', localtime()))

Wed Sep 16 13:54:37 2020
Wed Sep 16 13:54:47 2020

import calendar
#prints Calendar of specified month
c = calendar.month(2020,2)
print(c)
print("Calendar of year")

print (calendar.TextCalendar(calendar.MONDAY).formatyear(2017, 2, 2, 2, 2))

#Leap Year Check
a=int(input("Input year to enter"))
leap=calendar.isleap(a)
print(leap)                     

File Handling

File handling and allows users to handle files i.e., to read and write files, along with many other file handling options, to operate on file.

Key Words: open(), "w","r","a","read(5)",readlines()

• open(): "r": read(oPENING, ERROR IF FILE IS NOT THERE)

       "a": append- (open file, create a file if it does not exits and append)
       "w" : write-(open file, create a file if does not exits and write)
  

• "t": Text: Default value(Text mode)

• "b": Binary: Binary mode(Images)

f = open(r"C:\Users\suyashi144893\Documents\data Sets\Mobilevariants.txt","r")
print(f)

<_io.TextIOWrapper name='C:\\Users\\suyashi144893\\Documents\\data Sets\\Mobilevariants.txt' mode='r' encoding='cp1252'>

f=open("Dat.txt","a")#
f.write("\npython")
f.close()

f=open("Dat.txt","r")#creating a text file 
a=f.read()
print(a)
f.close()

pythonpython
python

a=input("enter Name of file you want to open:")
file=open(a)
#file=open("‪Quiz.txt","r")
#a=file.read() # reads whole file
b=file.read(10) # reads 10 letters
c=file.readlines() # reads two lines
#print(a)
#print(b)‪
print(a)
file.close()

enter Name of file you want to open:dat.txt
dat.txt

with open("Demo.txt","r") as f:   
    data = f.read()  
print(data)

HI 
THis is python
classsss
Welcomeall
study

## We can also split lines using file handling in Python. 
#This splits the variable when space is encountered.
with open("Demo.txt", "r") as file: 
    data = file.readlines() 
    for line in data: 
        word = line.split() 
        print (word )

['HI']
['THis', 'is', 'python']
['classsss']
['Welcomeall']
['study']

Ques: Program to count number of lines in a file

with open("ashi.txt" ,"w") as f:
   f.write("Python is an interpreted\n, high-level, \ngeneral-purpose programming language. \nCreated by Guido van Rossum and first released in 1991, Python's design \nphilosophy emphasizes \ncodereadability with its notable use of significant whitespace")
#Program to count no. of lines:
with open("ashi.txt") as file:
    for i,l in enumerate(file):#Enumerate means look line by line.
        print(i,l)
    lines=i+1
print("Number of lines in file:",lines)

Ques: Program to find largest word in a file

#Program to print largest word in file:
with open("ashi.txt") as file:
    words=file.read().split()
    print(words)
    max_len=len(max(words,key=len))
    for word in words:
        if len(word)==max_len:
            print("The longest word in file = %s and its length = %d :"%(word,max_len))

To get the file size of a plain file

def file_size(file):
        import os
        statinfo = os.stat(file)
        return statinfo.st_size

print("File size in bytes of a plain file  = ",file_size("Demo.txt"),"bytes")

File size in bytes of a plain file  =  48 bytes

To copy one file to another

from shutil import copyfile
copyfile('ashi.txt', 'ab1.txt')
print("ashi.txt is copy created")