How to Generate Random Strings with Uppercase Letters and Digits in Python?

Random String Generation with Uppercase Letters and Digits

Generating a random string of specified length can be achieved by combining numbers and uppercase English letters. This is commonly used for generating unique identifiers or security-related codes. Here are the steps involved:

Creating the Character Set:

The first step is to create a character set consisting of uppercase letters and digits. Python's string module provides the ascii_uppercase and digits constants for this purpose:

character_set = string.ascii_uppercase + string.digits

Generating Random Characters:

To generate random characters from the character set, use the random.choice() function. Place this within a list comprehension to create a list of desired length:

random_characters = [random.choice(character_set) for _ in range(N)]

Convert to String:

Finally, the list of random characters needs to be converted into a string:

random_string = ''.join(random_characters)

Example:

Using the provided one-line solution:

random_string = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(N))

Alternatively, using the random.choices() function (Python 3.6 ):

random_string = ''.join(random.choices(string.ascii_uppercase + string.digits, k=N))

Reusable Function:

For reusability, create a custom function:

def id_generator(size=6, chars=string.ascii_uppercase + string.digits):
    return ''.join(random.choice(chars) for _ in range(size))

Usage:

Generate a 6-character random string using the function:

>>> id_generator()
'G5G74W'

Generate a 3-character random string using a custom character set:

>>> id_generator(3, "6793YUIO")
'Y3U'

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