readline() to read a line of text from a file in Python

readline()

readline(limit)

limit : optional upper limit of bytes returned.
Output is the line of data from the file.

fob=open('data.txt','r')
print(fob.readline()) # This is first line

Output is here ( used the data.txt file given at file read() ) Using limit

fob=open('data.txt','r')
print(fob.readline(5)) # This
fob.close()

Multiple lines of data

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

Output

This is first line

This is second line

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