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- Last updated Apr 25, 2024
Python has a built-in function to open, read, and write files.
The open() function opens a file and return it as a file object.
Reading Text File
The file object in Python has a readlines() method which can be used to read contents of text files. For example:
file_not_found = False
try:
file = "test.txt"
with open(file) as tf:
lines = tf.readlines()
for line in lines:
print(line)
except FileNotFoundError as ex:
print("Error reading file : " + str(ex))
file_not_found = True
finally:
if not file_not_found:
print("Closing file...")
tf.close()
Writing to Text files
The file object in Python has a writelines() method which can be used to write in text files. For example:
file_not_found = False
try:
file = "test.txt"
with open(file, mode='w') as tf:
lines = ["This is first line.\n", "This is second line.\n", "This is third line.\n"]
tf.writelines(lines)
except FileNotFoundError as ex:
print("Error writing to file : " + str(ex))
file_not_found = True
finally:
if not file_not_found:
print("Closing file...")
tf.close()