cs1101-week2-journal.py

"""
Part 1

rite a function called print_volume (r) that takes an argument for the radius of the sphere, and prints the volume of the sphere.
Call your print_volume function three times with different values for radius.

"""

# define a constant variable PI
PI = 3.141592653589793

# calculate the volume
def print_volume(radius):
    print((4/3) * PI * (radius**3))




"""
Part 2

Write your own function that illustrates a feature that you learned in this unit. The function must take at least one argument.  

"""

# importing regular expression library
import re

"""
googbox is a function that transforms a google drive image shared url or dropbox shared url into direct url that can be used directly as an image source in html file 

goobox takes  url <string> as an argument and do the following:
 1- check if the url is already a valid direct url, if so returns an error.
 2- check if it's a google drive shared url, and transform it to a direct url, returns the new direct url.
 3- check if it's a dropbox shared url, return a new direct url
 4- otherwise, if the url is not valid, returns an error
 
 I own this function, more info here: https://github.com/ahmad-ali14/dg-url
"""
def goobox(url):

    # regular expressions, for shared google drive and dropbox url
    dropbox_regex = "(http(s)*:\/\/)*(www\.)*(dropbox.com)"
    drive_regex = "(http(s)*:\/\/)*(www\.)*(drive.google.com\/file\/d\/)"

    # regular expressions for direct ggogle drive and dropbox url
    drive_direct_url_regex = "^(https:\/\/drive.google.com\/uc\?id=)"
    dropbox_direct_url_regex = "^(https:\/\/dl.dropbox.com)"

    # if the url is already a valid direct url, returns an error
    if re.search(drive_direct_url_regex, url) or re.search(dropbox_direct_url_regex, url):
        return "your URL is already a direct url, please use it as it is"

    # if it is a shared dropbox url 
    if re.search(dropbox_regex, url):
        # return direct dropox url, by replacing "www." with "dl."
        return re.sub("(http(s)*:\/\/)*(www\.)*", "https://dl.", url, 1)

    # if it is a shared google drive url
    elif re.search(drive_regex, url):

        # prefix for direct gdrive urls
        url_starter = "https://drive.google.com/uc?id="

        # extract the file id from the url itself
        _file_id = re.sub(drive_regex, "", url)
        file_id = re.split("/",_file_id)

        # return the direct url by compining the prefix with the file Id
        return url_starter + file_id[0]

    # if it is not a valid gdrive/dropbox url, return an Error
    else:
        return "Error, Wrong URL, not a vlid drobox or google drive url"


# our progrram entry point
if __name__ == "__main__":

    # calling print_volume() three times
    print_volume(4) # 201.06192983
    print_volume(1) # 3.14159265359
    print_volume(10) # 3141.59265359

    # calling goobox with differnt cases
    print(goobox("https://drive.google.com/uc?id=1VctOazcyDrm8nxoWFAWM_t5bxlpyLI9s")) # your URL is already a direct url, please use it as it is
    print(goobox("https://ahmad-ali.co.uk/")) # Error, Wrong URL, not a vlid drobox or google drive url
    print(goobox("https://drive.google.com/file/d/1VctOazcyDrm8nxoWFAWM_t5bxlpyLI9s/view?usp=sharing")) # https://drive.google.com/uc?id=1VctOazcyDrm8nxoWFAWM_t5bxlpyLI9s
    print(goobox("https://www.dropbox.com/s/degru93hceo26m6/30sec.png?dl=0")) #https://dl.dropbox.com/s/degru93hceo26m6/30sec.png?dl=0