> f.close() # Read line-by-line using readline() in a while-loop > f.read() # Read entire file into a string > f.close() # Open the file for reading and read the entire file via read() > f.readline() # Return an empty string after EOF

> f.readlines() # Read all (next) lines into a list of strings > f.readline() # Read next line into a string > f.close() # Always close the file # Check the contents of the file created # Open the file created for reading and read line(s) using readline() and readlines() The ' ' will be translated to the platform-dependent newline ( ' ' for Windows or ' ' for Unixes/Mac OS).Įxamples # Open a file for writing and insert some records You need to explicitly terminate the str with a ' ', if needed. fileObj.write( str) -> int: Write the given string to the file and return the number of characters written.fileObj.read() -> str: Read the entire file into a string.fileObj.readlines() -> : Read all lines into a list of strings.It returns an empty string after the end-of-file (EOF). fileObj.readline() -> str: (most commonly-used) Read next line (upto and include newline) and return a string (including newline).It initially positions at the beginning of the file and advances whenever read/write operations are performed. The fileObj returned after the file is opened maintains a file pointer.

fileObj.close(): Flush and close the file stream.You can optionally specify the text encoding via keyword parameter encoding, e.g., encoding='utf-8'. You can also use 'rb', 'wb', 'ab', 'rb+' for binary mode (raw-byte) operations. The available modes are: 'r' (read-only - default), 'w' (write - erase all contents for existing file), 'a' (append), 'r+' (read and write).

open( file, ) -> fileObj: Open the file and return a file object.

Python provides built-in functions and modules to support these operations.

Open the file for read or write or both.

The match below stops at the nearest full stop, since it is not included in the group. The below pattern matches one or more are words, followed by a space, after which there must be one or more matches of any alphanumeric character, a comma, or space. Here is an example using some of the above rules. Match if number of repetitions are exactly 3 times Match if the number of repetitions are anywhere from 1 to 3 times Matches zero or more occurrences of the preceding character/identifier Matches any character, except a newline( )Īpart from identifies, there are certain operators/modifiers which regular expressions follow. These are pattern identifiers and the rule that each identifier follows.

Python find word in file with re