Next, use the len() function to find the length of the list which is nothing but total lines present in a file.The readlines() method reads all lines from a file and stores it in a list.
This is the most straightforward way to count the number of lines in a text file in Python. If your file size is small and you are not concerned with performance, then the readlines() method is best suited. Output: Total lines: 8 Use readlines() to get Line Count With open(r'E:\demos\files\read_demo.txt', 'rb') as fp:Ĭ_generator = _count_generator(fp.raw.read)Ĭount = sum(unt(b'\n') for buffer in c_generator) To get a faster solution, use the unbuffered (raw) interface, using byte arrays, and making your own buffering. This solution accepts file pointer and line count.
Readlines izip python generator#
If the file contains a vast number of lines (like file size in GB), you should use the generator for speed. Generator and Raw Interface to get Line CountĪ fast and compact solution to getting line count could be a generator expression. Note: enumerate(file_pointer) doesn’t load the entire file in memory, so this is an efficient fasted way to count lines in a file.Using enumerate, we are not using unnecessary memory.The enumerate() function adds a counter to each line.
Readlines izip python zip file#
This code will create a new ZIP file named new.zip that has the compressed contents of open(r"E:\demos\files\read_demo.txt", 'r') as fp: write ( 'spam.txt', compress_type =zipfile. # 'C:\\spam.txt' # 'C:\\someĮw\\folders\\spam.txt' Creating and Adding to ZIP Files > import zipfile ZipFile ( 'example.zip' ) as example_zip. The extract() method for ZipFile objects will extract a single file from the ZIP file: > with zipfile. chdir ( 'C:\\' ) # move to the folder with example.zip > with zipfile. The extractall() method for ZipFile objects extracts all the files and folders from a ZIP file into the current working directory. # 13908 # 3828 # 'Compressed file is 3.63x smaller!' Extracting from ZIP Files print ( 'Compressed file is %sx smaller!' % ( round (spam_info.
# ] Reading ZIP files > import zipfile, os Since these methods return list-like values instead of true lists, you should pass them to the list() function to get them in list form. Just like dictionaries, shelf values have keys() and values() methods that will return list-like values of the keys and values in the shelf. To open and read variables: > with shelve. > print (content ) # Hello world! # Bacon is not a vegetable. # 25 > with open ( 'bacon.txt' ) as bacon_file. # 13 > with open ( 'bacon.txt', 'a' ) as bacon_file. # When, in disgrace with fortune and men's eyes, # I all alone beweep my outcast state, # And trouble deaf heaven with my bootless cries, # And look upon myself and curse my fate, Writing to files > with open ( 'bacon.txt', 'w' ) as bacon_file. You can also iterate through the file line by line: > with open ( 'sonnet29.txt' ) as sonnet_file. > hello_contentĪlternatively, you can use the readlines() method to get a list of string values from the file, one string for each line of text: > with open ( 'sonnet29.txt' ) as sonnet_file. Opening and reading files with the open() function > with open ( 'C:\\Users\\your_home_folder\\hi.txt' ) as hello_file. To read/write to a file in Python, you will want to use the with statement, which will close the file for you after you are done, managing the available resources for you. Reading and Writing Files The file Reading/Writing process