The open() function returns a file object that has a read() method to read the contents of the file:

  1. f = open(“demofile.txt”, “r”)
  2. Return the first 5 characters of the file:
  3. Read one line of the file:
  4. Read two lines of the file:
  5. Iterate through the file line by line :
  6. Close the file when you’re done:

Then how do I open and read a file in Python?


  1. Python allows reading, writing and deleting files.
  2. Use the open(“filename”,”w+”) function to create a file.
  3. To append data to an existing file, use the command open(“filename”, “a”)
  4. Use the read function to read the ENTIRE contents of a file.
  5. Use the readlines function to read the contents of the file one by one.

Besides the above, how do you iterate through a line in Python? Use a for loop to iterate through the lines of a file

In a with statement, use open(file, mode) with mode as “r” to open the file for reading. Inside the with statement, use a for loop to iterate through the lines. Then call str. strip() to remove the newline from each line.

Similarly, how do I read the first line of a file in Python?

There are two ways to do this to the first line of a given input file.

  1. readline(): Returns the entire line from the file. line = f.readline()
  2. readlines(): Returns a list containing all lines. lines = f.readlines() print(lines[0]) → For 1st line. print(lines[1]) → For the 2nd line (assuming the file has multiple lines)

What does data file mean?

A data file is any file that contains information but no code; It is intended for reading or viewing only and not for execution. Programs can also rely on data files for information. For example, a data file may contain a program’s settings that tell the program how to display information.

What is the difference between read and readlines in Python?

When you create a File object in Python you can read from it in different ways. Only today I understood the difference between readline() and readlines(). The answer is in the name. readline() reads one line character at a time, readlines() reads the entire file at once and splits it line by line.

How do I read a large file in Python?

The Python File -Object offers different ways to read a text file. The popular way is to use the readlines() method, which returns a list of all the lines in the file. However, it is not suitable for reading a large text file, since the entire file content is loaded into memory.

How to count lines in Python?

How to Count Number of lines in File with Python

  1. fname = “test.txt”
  2. count = 0.
  3. with open(fname, ‘r’) as f:
  4. for line in f:
  5. count += 1.
  6. print(“Total number of lines is:”, count.

How to read a text file in Python?

There are three ways to read data from a text file:

  1. read() : Returns the bytes read in the form of a string .
  2. readline() : Reads a line of the file and returns it as a string.
  3. readlines() : Reads all lines and returns them as a string for each line Item in a list.

How do I print a specific line in a text file in Python?

Read a specific line from a text file in Python

  1. file_variable = open(‘filename.txt’)
  2. all_lines_variable = file_variable.readlines()
  3. print(all_lines_variable[specific_line_number – 1])

What is the first line in Python?

The first line of all your Python programs should be a shebang line, which tells your computer that Python should run this program. The shebang line starts with #! , but the rest depends on your operating system. On Windows, the shebang line is #! python3 .

How do you get a specific line in a python file?

Read a specific line of a file with Python. We can use the readlines method to access a specific line in the file. Notice that it prints two lines because the line had a line ending and the print adds another line ending. You can use strip method e.g. B. print(test_lines[1].

How do I read a binary file?

To read binary data files, define the variables, open the file for reading, and read the bytes into these variables. Each variable reads as many bytes from the file as the specified data type and organizational structure require.

What are the two file types in Python?

There are There are two types of files in Python and each of them is explained in detail below with examples for your easier understanding: File Types in Python

  • Document files: .pdf, .
  • Image files: .png, .
  • Video files: .mp4, .
  • Audio files: .
  • Database files: .
  • Archive files: .
  • Executable files: .exe, .

How do I open a .data file?

Click on “File” and then on “Open” Locate the folder where the .data file is located, click on the file and click “Open” The .data file is now working in Notepad.

How do you print the n ext line in Python?

Just use ; Python automatically translates that to the correct newline character for your platform. The newline character is . It is used within a string. where is the newline character.

Opens Python create file?

Python has a built in function open() to open a file. This function returns a file object, also called a handle because it’s used to read or modify the file appropriately. We can specify the mode when opening a file. In mode we indicate whether we want to read ‘r’, write ‘w’ or append ‘a’ to the file.

How to read the last line of a file in Python?

To perform “end relative” searches, you must open the file as a binary file. We search up to 2 characters before the end (since the file will probably end with a newline). Then continue reading a single byte until a newline is encountered. Then use readline() to read the last line and decode() to convert bytes to strings.

What is a strip in Python?

strip() is a Python built-in function Python programming language that returns a copy of the string with leading and trailing characters removed (based on the string argument passed).

How does readline work in Python?

readline reads each line fine. It starts reading parts of the file from the beginning. If it encounters a newline, it returns that line. Each subsequent call to readline returns the next line until the last line is read.