Python write to text file line by line

Python write to text file line by line

Here's the code:

import python
def write_to_file():
with open('output.txt', 'w') as f:
for i in range(100):
for j in range(3):
if j == 0:
line = "Line {}: This is a new linen".format(i)
elif j == 1:
line = "This line is longer and it has more wordsn"
else:
line = "It's okay, I can still write more linesn"
f.write(line)
if name == "main":
write_to_file()

Let me know if this meets your requirements.

This script will generate a text file named output.txt and fill it with 100 lines. Each line has three different formats for demonstration purposes.

How to read a text file in Python

Here is a detailed explanation of how to read a text file in Python:

Reading a text file in Python can be done using various methods and libraries. Here are some ways you can do it:

Method 1: Using the Built-in open() Function

The built-in open() function in Python allows you to read or write files. To read a text file, you need to specify 'r' as the mode. Here's how you can do it:

with open('example.txt', 'r') as file:
content = file.read()
print(content)

In this example, replace 'example.txt' with your actual file name and path. The with statement ensures that the file is properly closed after reading, regardless of whether an exception occurs or not.

Method 2: Using the read() Method

The read() method returns the contents of a text file as a string. Here's how you can use it:

with open('example.txt', 'r') as file:
content = file.read()
print(content)

This is similar to the first method, but uses the read() method instead of specifying 'r' in the open() function.

Method 3: Using a Context Manager (With Statement)

The context manager allows you to perform some action after opening and closing the file. Here's how you can use it:

with open('example.txt', 'r') as file:
for line in file:
print(line.strip())

This method is useful when you want to process each line of the file individually.

Method 4: Using Python's Built-in File Objects (TextIO)

Python's built-in file object provides several methods and attributes that allow you to read a text file. Here's how you can use it:

with open('example.txt', 'r') as file:
content = file.read()
print(content)

This is similar to the first method, but uses Python's built-in file object instead of specifying 'r' in the open() function.

Method 5: Using the readline() Method

The readline() method returns the next line from a text file. Here's how you can use it:

with open('example.txt', 'r') as file:
while True:
line = file.readline()
if not line:
break
print(line.strip())

This method is useful when you want to process each line of the file individually.

Method 6: Using the readlines() Method

The readlines() method returns a list of all lines from a text file. Here's how you can use it:

with open('example.txt', 'r') as file:
content = file.readlines()
for line in content:
print(line.strip())

This method is useful when you want to process each line of the file individually.

In conclusion, there are several ways to read a text file in Python. The choice of method depends on your specific requirements and personal preference.