{"id":481,"date":"2023-02-16T11:14:48","date_gmt":"2023-02-16T11:14:48","guid":{"rendered":"https:\/\/tinyytopic.com\/?p=481"},"modified":"2023-02-16T11:14:38","modified_gmt":"2023-02-16T11:14:38","slug":"library-of-small-python-functions","status":"publish","type":"post","link":"https:\/\/tinyytopic.com\/index.php\/2023\/02\/16\/library-of-small-python-functions\/","title":{"rendered":"Library of small Python custom functions"},"content":{"rendered":"\t\t\t\t
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\n\t\t\t\t\t\t\tTable Of Contents\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t
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  1. How to open a folder directory?<\/a>
  2. How to open a file directory?<\/a>
  3. How to find a string between two characters or strings?<\/a>
  4. Create a directory if not exists<\/a>
  5. Access the index of an element in ‘for’ loop:<\/a><\/ol>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\n\n\n

    How to open a folder directory?<\/mark><\/h5><\/div>\n\n\n\n

    A quick Python function to browse a folder:<\/p>\n\n\n\n

    def browse_open_folder_directory():\n    f_path = filedialog.askdirectory()\n    if not f_path: return\n    return f_path<\/pre>\n\n\n\n
    Write your main code as a sample below,<\/p>\n\n\n\n
    from tkinter import filedialog\n\nprint(browse_open_folder_directory())<\/code><\/pre>\n\n\n\n
    A sample output of the code is,<\/p>\n\n\n\n
    C:\\Downloads<\/code><\/pre>\n\n\n\n
    How does the function work?<\/mark><\/p>\n\n\n\n
    The Python function browse_open_folder_directory<\/code> does not take any arguments, but it opens a dialog box using the filedialog<\/code> module of the tkinter<\/code> library. The dialog box allows the user to browse their system to select a folder or directory.<\/p>\n\n\n\n
    Here is a breakdown of how the function works:<\/p>\n\n\n\n
      \n
    1. The filedialog.askdirectory()<\/code> method is used to open a dialog box that allows the user to browse their system to select a folder or directory. This method returns the path of the selected folder or directory as a string.<\/li>\n\n\n\n
    2. The if<\/code> statement checks if the f_path<\/code> variable contains a valid value (i.e., it is not None<\/code>). If f_path<\/code> is empty or None<\/code>, the function immediately returns with no value.<\/li>\n\n\n\n
    3. If the f_path<\/code> variable contains a valid value, the function returns the value of f_path<\/code>.<\/li>\n<\/ol>\n\n\n\n

      How to open a file directory?<\/mark><\/h5><\/div>\n\n\n\n
      A quick Python function to browse a file:<\/p>\n\n\n\n
      def browse_open_file_directory():\n    f_path = filedialog.askopenfilename()\n    if not f_path: return\n    return f_path<\/pre>\n\n\n\n
      Write your main code as a sample below,<\/p>\n\n\n\n
      from tkinter import filedialog\n\nprint(browse_open_file_directory())<\/code><\/pre>\n\n\n\n
      A sample output of the code is,<\/p>\n\n\n\n
      C:\\Downloads\\scaled_image.jpg<\/code><\/pre>\n\n\n\n
      How does the function work?<\/mark><\/p>\n\n\n\n
      The Python function browse_open_file_directory<\/code> does not take any arguments, but it opens a file dialog box using the filedialog<\/code> module of the tkinter<\/code> library. The dialog box allows the user to browse their system to select a file.<\/p>\n\n\n\n
      Here is a breakdown of how the function works:<\/p>\n\n\n\n
        \n
      1. The filedialog.askopenfilename()<\/code> method is used to open a dialog box that allows the user to browse their system to select a file. This method returns the path of the selected file as a string.<\/li>\n\n\n\n
      2. The if<\/code> statement checks if the f_path<\/code> variable contains a valid value (i.e., it is not None<\/code>). If f_path<\/code> is empty or None<\/code>, the function immediately returns with no value.<\/li>\n\n\n\n
      3. If the f_path<\/code> variable contains a valid value, the function returns the value of f_path<\/code>.<\/li>\n<\/ol>\n\n\n\n

        How to find a string between two characters or strings?<\/mark><\/h5><\/div>\n\n\n\n
        A quick Python function to find a string between two strings:<\/p>\n\n\n\n
        def find_string_between_chars(txt, first_char, last_char, start_location=0):\n    # Find a string between two characters in a text data\n    \n    output_char = 'Not found!'\n    EndLoc = 0\n    \n    InitLoc = txt.find(first_char, start_location) + len(first_char)\n    if InitLoc < len(first_char): return output_char, EndLoc\n    \n    EndLoc = txt.find(last_char, InitLoc)\n    if EndLoc < 1: return output_char, EndLoc\n    \n    output_char = txt[InitLoc:EndLoc]\n    output_char = ' '.join(output_char.split()) # replace continues white spaces with single space\n    \n    return output_char, EndLoc\n<\/pre>\n\n\n\n
        Write your main code as a sample below,<\/p>\n\n\n\n
        txt = \"The Python is a open source programming language!\"\nfirst_char = \"a \"\nlast_char = \"prog\"\n\noutput_char, end_loc = find_string_between_chars(txt, first_char, last_char)\n\nprint(output_char)\n<\/code><\/pre>\n\n\n\n
        The output of the code is,<\/p>\n\n\n\n
        \"open source\"<\/code><\/pre>\n\n\n\n
        How does the function work?<\/mark><\/p>\n\n\n\n
        The Python function find_string_between_chars<\/code> takes four parameters:<\/p>\n\n\n\n
          \n
        1. txt<\/code>: a string in which the function will search for a substring located between two other substrings.<\/li>\n\n\n\n
        2. first_char<\/code>: the substring that marks the beginning of the substring we want to extract.<\/li>\n\n\n\n
        3. last_char<\/code>: the substring that marks the end of the substring we want to extract.<\/li>\n\n\n\n
        4. start_location<\/code>: the index in txt<\/code> where the search will begin. By default, it is set to 0.<\/li>\n<\/ol>\n\n\n\n
          The function returns a tuple containing two values:<\/p>\n\n\n\n
            \n
          1. output_char<\/code>: the substring located between first_char<\/code> and last_char<\/code>. If no such substring is found, the value is set to 'Not found!'<\/code>.<\/li>\n\n\n\n
          2. EndLoc<\/code>: the index in txt<\/code> where the search ended.<\/li>\n<\/ol>\n\n\n\n
            Here’s a step-by-step explanation of how the function works:<\/p>\n\n\n\n
              \n
            1. The variable output_char<\/code> is initialized to the string 'Not found!'<\/code>, and the variable EndLoc<\/code> is initialized to 0.<\/li>\n\n\n\n
            2. The variable InitLoc<\/code> is set to the index of the first occurrence of first_char<\/code> in txt<\/code>, starting the search from the index given by start_location<\/code>. The find<\/code> method returns -1 if the substring is not found, so we add len(first_char)<\/code> to InitLoc<\/code> to get the index where the substring we want to extract begins. If InitLoc<\/code> is less than len(first_char)<\/code>, it means that first_char<\/code> was not found, so we return the tuple (output_char, EndLoc)<\/code>.<\/li>\n\n\n\n
            3. The variable EndLoc<\/code> is set to the index of the first occurrence of last_char<\/code> in txt<\/code>, starting the search from the index given by InitLoc<\/code>. If EndLoc<\/code> is less than 1, it means that last_char<\/code> was not found, so we return the tuple (output_char, EndLoc)<\/code>.<\/li>\n\n\n\n
            4. The variable output_char<\/code> is set to the substring of txt<\/code> that starts at InitLoc<\/code> and ends at EndLoc<\/code>. We then use the join<\/code> and split<\/code> methods to remove any consecutive whitespace characters in the substring.<\/li>\n\n\n\n
            5. We return the tuple (output_char, EndLoc)<\/code>.<\/li>\n<\/ol>\n\n\n\n

              Create a directory if not exists<\/mark><\/h5><\/div>\n\n\n\n
              use the os module in Python to create a directory if it doesn’t exist already. Here’s an example function that takes a directory path as an argument and creates the directory if it doesn’t exist:<\/p>\n\n\n\n
              import os\n\ndef create_directory(path):\n    if not os.path.exists(path):\n        os.makedirs(path)\n<\/pre>\n\n\n\n

              Write your main code as a sample below,<\/p>\n\n\n\n
              create_directory(\"\/path\/to\/directory\")\n<\/code><\/pre>\n\n\n\n
              If the directory doesn’t exist, the function will create it and print a message saying that the directory was created. If the directory already exists, the function will print a message saying that the directory already exists.<\/p>\n\n\n\n

              Access the index of an element in ‘for’ loop:<\/mark><\/h5><\/div>\n\n\n\n
              In Python, you can access the index of an element in a sequence when iterating through it using a for<\/code> loop by using the built-in function enumerate()<\/code>.<\/p>\n\n\n\n

              To start the index from 0 (Zero):<\/p>\n\n\n\n
              fruits = ['apple', 'banana', 'cherry']\n\nfor index, fruit in enumerate(fruits):\n    print(index, fruit)<\/pre>\n\n\n\n

              To start the index from 1 (One):<\/p>\n\n\n\n
              fruits = ['apple', 'banana', 'cherry']\n\nfor index, fruit in enumerate(fruits, start=1):\n    print(index, fruit)<\/pre>\n\n\n\n
              Output:<\/p>\n\n\n\n
              1 apple\r\n2 banana\r\n3 cherry\r<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
              A quick Python function to browse a folder: Write your main code as a sample below, A sample output of the code is, How does the function work? The Python function browse_open_folder_directory does not take any arguments, but it opens a dialog box using the filedialog module of the tkinter library. The dialog box allows […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[12,17],"tags":[14,13,16,31,32,15],"class_list":["post-481","post","type-post","status-publish","format-standard","hentry","category-python","category-useful-function","tag-programming-language","tag-python","tag-python-code","tag-python-functions","tag-python-library","tag-python-sample-code"],"aioseo_notices":[],"yoast_head":"\nLibrary of small Python custom functions - tinyytopic.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tinyytopic.com\/index.php\/2023\/02\/16\/library-of-small-python-functions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Library of small Python custom functions - tinyytopic.com\" \/>\n<meta property=\"og:description\" content=\"A quick Python function to browse a folder: Write your main code as a sample below, A sample output of the code is, How does the function work? 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