The main problem with parsing a filename is that it can be difficult to determine the correct path to the file.
for date
Assuming you have a filename in the format "YYYYMMDD_filename.txt", you can use the following code to parse the date out of the filename:
import datetime filename = "20160301_filename.txt" # Get position of first underscore in string underscore_index = filename.find("_") # Parse date from string date_string = filename[:underscore_index] file_date = datetime.datetime.strptime(date_string, "%Y%m%d").date() print(file_date) # Output: 2016-03-01
This code imports the datetime module, which contains functions for working with dates.
The code then defines a filename string, and uses the find() method to get the index of the first underscore character in the string.
Next, it uses slicing to get the substring from the beginning of the string up to (but not including) the underscore character. This substring is then passed to the strptime() function, which parses it and returns a datetime.date object.
Finally, the code prints out the date object.
Parsing
Parsing in Python is the process of turning a sequence of text into a data structure that can be used by the Python interpreter. This can be done using a variety of different techniques, including regular expressions, string manipulation, and data structures.
How to parse
In Python, parsing is the process of taking a string of text and turning it into a data structure. This can be done by using the built-in parser functions or by writing your own.
To parse a string, you first need to create an instance of the parser object. This object will contain all of the information necessary to parse the string. Next, you need to call one of the parser’s parse() methods. This method will take the string as input and return an object containing all of the information that was parsed from it.
Here is an example that shows how to use the parser object to parse a string:
import re import sys import time def main(): input = “This is a test” print(“Parsing took %s seconds” % (time.time() – start_time)) if __name__ == “__main__”: main()
