How to check if a file is empty or not?

file. Files. size() returns the size of a file, which can also help us to check if a file is empty.

Which command is used to check if file is not empty?

The test command uses “-s” to determine if a file exists and has a non-zero length. Negating it will give you an “is zero length” check.

How to check if a CSV file is empty?

Check for HEADER Only Sometimes, CSV files may contain only in header rows, which is not empty but may not contain meaningful data. To address this, count the number of lines in the file and check if there's only one line (the header) then it is empty .

How to check if a file is empty or not in C++?

open a file, peek(), and if it returns EOF, your file is empty .

What is the find command for empty files?

How to Search All Empty Files. You can use the -empty flag in the find command to search for files and directories that are empty . This command will list all the empty directories in the current directory. The -empty flag can be appended with the -delete flag to delete all the empty files and folders.

How do you check if an Excel file is empty?

Use “dt is Nothing” for checking null and dt. Rows. count = 0 is to check empty.

How do I find the null value in a CSV file?

In CSV files, a NULL value is typically represented by two successive delimiters (e.g. ,, ) to indicate that the field contains no data ; however, you can use string values to denote NULL (e.g. null ) or any unique string.

How to check if a CSV file is empty in C++?

If you don't have the file open already, just use the fstat function and check the file size directly. C++17 solution: #include <filesystem> const auto filepath = <path to file> (as a std::string or std::filesystem::path) auto isEmpty = (std::filesystem::file_size(filepath) == 0);

How do you check if object is blank or not?

The Object.keys() Method The Object. keys() method in JavaScript returns an array of enumerable property names of the object passed to the method as a parameter. If the method returns an empty array, then it means the given object is empty as it has no keys. This way we can check if object is empty javascript.

How to check if something is empty in C++?

Checking if the String is Empty in C++ To check for an empty string we can use the std::string::empty() function because what the empty function does is it checks for the length of a string and if the string is empty, it returns true, otherwise, it returns false.

How do you check whether object is empty or not?

The Object.keys() Method The Object. keys() method in JavaScript returns an array of enumerable property names of the object passed to the method as a parameter. If the method returns an empty array, then it means the given object is empty as it has no keys. This way we can check if object is empty javascript.

How do you check if file is present or not?

Using os. os. path. isfile() method in Python is used to check if a file exists or not. It checks whether the specified path is an existing regular file or not.

How do you tell if a file is read only?

Are the file properties set to read-only? You can check the file properties by right-clicking on the file and choosing Properties . If the Read-only attribute is checked, you can uncheck it and click OK.

How to check whether a File is Empty or not (2024)

In this article, we will learn to check whether a file is empty or not in Python. We will use some built-in functions, some simple approaches, and some custom codes as well to better understand the topic.

Check whether a File is Empty or Not

Programmers may encounter situations where they need to check whether a file has data or the file is empty before performing any file operations. The empty file does not contain any data and is of zero bytes. In order to check whether a file is empty or not, you must check that your file exists. If the file does not exist, it will return "FileNotFoundError".

We will learn four ways to check whether a file is empty or not.

os.stat() function
os.path.getsize() function
By reading the first character
Using regex module

Example: Check File Exists or Not

This method uses os.path.exists() from os module in Python to check whether a file exists or not. It takes the file path as an argument. It returns True if the file exists else it returns False.

import osdef check(file_name): # Check if file exist or not return os.path.exists(file_name)check("sample.txt")

True

Example: Check if the File is Empty using os.stat() Function

The os module provides os.stat().st_size function to check whether a file is empty or not. It takes the file path as an argument. It will check for the file size. If the file size is 0, it will print the file as Empty. If your file contains empty blanks or newlines, then it will print that file as Not Empty.

import oscheck_file = os.stat("sample.txt").st_sizeif(check_file == 0): print("The file is empty.")else: print("The file is not empty.")

The file is not empty.

Example: If File does not Exists

If you want to check about the file size and if the file does not exist, it will return "FileNotFoundError". Look at the code snippet below to see the error.

import oscheck_file = os.stat("textfile.txt").st_sizeif(check_file == 0): print("The file is empty.")else: print("The file is not empty.")

FileNotFoundError: [WinError 2] The system cannot find the file specified: 'textfile.txt'

Check if the File is Empty using os.path.getsize() Function

The os module provides another function os.path.getsize() to check whether a file is empty or not. It takes the file path as an argument. It will check for the file size. If the file size is 0, it will print the file as Empty. If your file contains empty blanks or newlines, then it will print that file as Not Empty.

import oscheck_file = os.path.getsize("sample.txt")if(check_file == 0): print("The file is empty.")else: print("The file is not empty.")

The file is not empty.

Example: If File does not Exists

If you want to check about the file size and if the file does not exist, it will also return "FileNotFoundError". Look at the code snippet below to see the error.

import oscheck_file = os.path.getsize("textfile.txt")if(check_file == 0): print("The file is empty.")else: print("The file is not empty.")

FileNotFoundError: [WinError 2] The system cannot find the file specified: 'textfile.txt'

Check if the File is Empty by Reading its First Character

This method opens the file in reading mode and reads only the first character of the given file using read() function. 1 is passed as an argument to denote the first character. It can also take empty blanks or newlines as the first character. If it is not able to read the first character of the file, it prints the file as Empty.

def check(filename): # open file in read mode with open(filename, 'r') as read_obj: # read first character first_char = read_obj.read(1) # if not fetched then file is empty if not one_char: print("File is empty") else: print("File is not empty")#function callcheck("sample.txt")

File is not empty

Example: If File does not Exists

If you want to check about the file size and if the file does not exist, it will also return "FileNotFoundError". Look at the code snippet below to see the error.

def check(filename): # open file in read mode with open(filename, 'r') as read_obj: # read first character first_char = read_obj.read(1) # if not fetched then file is empty if not one_char: print("File is empty") else: print("File is not empty")#function callcheck("textfile.txt")

FileNotFoundError: [Errno 2] No such file or directory: 'textfile.txt'

Conclusion

In this article, we learned how to check whether a file is empty or not in Python by using built-in functions such as os.path.getsize(), os.stat().st_size, read() and re.search() . We used some custom codes and file handling concepts as well. Two things to keep in mind are - Firstly, you must check whether your file exists or not to avoid "FileNotFoundError". Secondly, some files may appear non-empty when created, because of newline and carriage return characters.

How to check whether a File is Empty or not (2024)

Check whether a File is Empty or Not

Example: Check File Exists or Not

Example: Check if the File is Empty using os.stat() Function

Example: If File does not Exists

Check if the File is Empty using os.path.getsize() Function

Example: If File does not Exists

Check if the File is Empty by Reading its First Character

Example: If File does not Exists

Conclusion

FAQs

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