Python

Search

how to replace first line of a textfile python

with open("test.txt") as f:
    lines = f.readlines()

lines # ['This is the first line.
', 'This is the second line.
']

lines[0] = "This is the line that's replaced.
"

lines # ["This is the line that's replaced.
", 'This is the second line.
']

with open("test.txt", "w") as f:
    f.writelines(lines)

Comment

PREVIOUS	NEXT

Code Example
Python :: python convert list to absolute value
Python :: python program for printing fibonacci numbers
Python :: falsy values in python
Python :: tkinter open new window
Python :: pytest check exception
Python :: Substring in a django template?
Python :: numpy standard deviation
Python :: Adding new column to existing DataFrame in Pandas by assigning a list
Python :: how to read tuples inside lists python
Python :: python super init
Python :: how to enable execution time in jupyter lab
Python :: django drop database postgres
Python :: how to add three conditions in np.where in pandas dataframe
Python :: catch error python
Python :: Insert missing data in pandas
Python :: remove duplicates python
Python :: count rows with nan pandas
Python :: find null values pandas
Python :: python naming conventions
Python :: python remove last element from list
Python :: np.zeros data type not understood
Python :: n-largest and n-smallest in list in python
Python :: django query field is null
Python :: how to convert gb to mb in python
Python :: python sizeof
Python :: second y axis matplotlib
Python :: pyspark when otherwise multiple conditions
Python :: create close python program in puthon
Python :: accessing index of dataframe python
Python :: python scanner class

Search

PYTHON

how to replace first line of a textfile python

ADD CONTENT