#https://www.facebook.com/piyush.chandana.3/posts/1282062888823657

#Subscribed by Piyush Chandana

#file handling

'''

--> filehandling is the process of creating text,sv,tsv,excel,files and writing

some content into file,delete content from the file update into file.

'''

#python provide different types of modes to access file

'''

1>write mode(w)

2>read mode(r)

3>append mode(a)

4>write+mode(w+)

5>read+mode(r+)

6>append+mode(a+)

7>write in binary(wb)

8>read binary(rb)

'''

#w mode

'''

--> In write mode file can be created if file does not exist with specified file

name otherwise all the content of the file will be removed.

--> We can write some thing into file.

'''

'''

f=open("sample.text","w")

print(f.write("This is my first line\n"))

f.write("This is my first line.")

f.write("\n")

f.write("This is my second line")

f.close()

'''

#read mode

'''

--> In this mode we can read content from file or represent content of file

by a variable name if file exist othherwise raise FileNotFoundError.

'''

'''

f = open('sample.txt','r')

print(f.read())

f.seek(0)

print(f.read(7))

print(f.read())

f.seek(21)

print(f.read())

f.close()

'''

'''

f=open("sample.txt")

data=f.readlines()

print(data)

for i in data:

print(i)

f.close()

'''

#access each word of the file

'''

f=open("sample.txt","r")

data=f.read().split()

print(data)

for i in data:

print(i)

f.close()

'''

#3>append mode

'''

--> This mode provide environment to create

a flie with specified name if file does

not exist.

--> In this mode we can write something at

the last index of the file.

'''

'''

f=open("demo.txt","a")

f.write("Hello,how are you.")

f.write("\nwow previous content is existing")

f.close()

'''

# read+mode(r+)

'''

--> In this mode,we can write into file

as well as read from file.

--> As we open file in r+ mode,cursor will be

at start index.

--> When we write into file then existing characteris relaced by new character.

'''

'''

f=open("demo.txt","r+")

#print(f.read())

f.write("this")

f.seek(13)

f.write("we")

print(f.read())

f.close()

'''

#write+mode(w+)

'''

--> all features of write mode will be inherited.

--> additional features is that,we can read content of file.

'''

#creating new file

'''

f=open("demo1.txt","w+")

f.close()

'''

#removing content of existing file

'''

with open("demo.txt","w+") as f:

f.write("ägain create first line.")

f.close()

'''

#6> append +mode

'''

-->all the features of append mode will be inherited

-->reading content of file is additional feature.

'''

with open("demo.txt","a+") as f:

f.write("\nThis is second line")

f.seek(0)

print(f.read())

f.close()

'''

f=open("demo.txt")

data=f.readlines()

f.close()

list1=[]

for i,v in enumerate(data,start=1):

if(i==3):

v=v.replace("This","That")

list1.append(v)

f=open("demo.txt","w")

for i in list1:

f.write(i)

f.close()

'''