File read in Python

Mode of file opening

Mode	Details
r	Read only ( if file exist) , no file is created
w	Write file, file is created if not available. Over written if file already exist.
x	Create file if not exit. Return error if file is already available.
a	Append file ,file is created if not exists

Mode of handling the file

t	Text mode ( default )
b	Binary Mode

Reading file, our built-in function open() will return one file object fob For all these examples we created one data.txt file with four lines of text. You can create your file and keep in the same folder having your python files.

fob=open('data.txt','r')
print(fob.read())

This will print the total content of our file data.txt

This is first line
This is second line
This is third line
This is fourth line

We can read part of the file by giving input parameter.

fob=open('data.txt','r')
print(fob.read(10))

10 chars are printed

This is fi

Reading Binary data

rb : Read Binary ( mode )

fob=open('G:\\My Drive\\testing\\my_db\\sqlite-blob1.jpg','rb')
blob_data=fob.read()

Reading a line by using readline()

fob=open('data.txt','r')
print(fob.readline())

Output is here , prints the first line.

This is first line

By using the print command again we can print second line as the file pointer moves to next line after printing first line

fob=open('data.txt','r')
print(fob.readline())
print(fob.readline())

Output will give us first two lines.

This is first line

This is second line

Reading every line till end

fob=open('data.txt','r')
for i in fob:
 print(i)

Output is here

This is first line

This is second line

This is third line

This is fourth line

It is a good idea to close file object at the end

fob=open('data.txt','r')
for i in fob:
 print(i)
fob.close()

mode='x' will generate error if file is already available. It will create a new file and add data.

fob=open('data4.txt','x')
fob.write("Hello")
fob.close()
fob=open('data4.txt','r')
print(fob.readline()) # Hello
fob.close()

Getting the mode of file object

print(fob.mode)

Output is mode used while creating the file object ( r, w, a , x )

Moving the file position by seek() We can read the file position by tell()

File Append File Write

File handling methods list Python- Tutorials

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File handling in Python

Mode of file opening

Reading Binary data

Reading a line by using readline()

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