Python: read only the first line of a file

Question

How can I read only the first line of an input file in Python?

E.g. 

My file has the following content and I want to just get the header.

name,age,sex

app,32,m

bee,12,f

mfg,23,m

Answer 1

You can use readline() or readlines() to get the first row of an input file. Here is an example using your input data.

Using readline()

with open('testfile.txt', 'r') as f:
    rec = f.readline()
print(rec)

Using readlines()

with open('testfile.txt', 'r') as f:
    rec = f.readlines()
print(rec[0].strip())

These codes will print the following:

name,age,sex