How to make simple four-digit CAPTCHA code for Python random module

In this issue, the editor will bring you how to make a simple four-digit CAPTCHA on the Python random module. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

Let's first introduce the random module in python.

Comparison of random and numpy.random:

1. Random.random (): generate random floating point numbers between [0rem 1]

Numpy.random.random (): generate random floating-point numbers between [0Phon1)

Numpy.random.random (size= (2)), produces a 2-dimensional random array with 2 random numbers per dimension, data interval [0J1]

2. Random.randint (aformab): produce random integers between [aformab]

Numpy.random.random (1mem5): returns an one-dimensional array of 5 elements with a data interval of [1mem5)

Numpy.random.random: returns a two-dimensional array of 2 random numbers for each dimension, with a data interval of [1d5].

3. Random.randrange: return random numbers in [1mem3, 5, 5, 7, 9].

4. Random.choice (seq): returns a random element of a sequence from a non-empty sequence

Numpy.random.choice (5Power2) randomly generates an array of two random integers from [0Power5).

5. Random.uniform (aformab): randomly produce floating-point numbers x, [aPermib]

6. Random.randn (2): returns a 2-dimensional random array with 2 random numbers for each dimension

The returned value of random.rand () conforms to the standard normal distribution, and the data interval is [0jue 1].

The following is an example code of the four-digit CAPTCHA function of the Python random module.

The code is as follows:

Import random # calling the random module checkcode='' # is equivalent to creating an empty string called checkcode for i in range (4): # the next operation loops four times (finally generating a 4-digit CAPTCHA) current=random.randrange (0Query 4) # randomly select 0 1 if current==i: # if the generated random number is exactly equal to the current digit bit tmp=chr (random.randint (65J 90)), then an integer of 65 Meli 90 is randomly generated and converted to the character (chr (I) in the ASCII code, which means: I can be a decimal or hexadecimal number, and the return value is the ASCII character corresponding to the current integer. ) 'else: # if the generated random number is not equal to the current digit bit tmp=random.randint (0 9) # return an integer checkcode+=str (tmp)' checkcode=checkcode+str (tmp) of 0 Murmur9, convert each generated number or letter into a string called checkcode and put it in a string called 'print (checkcode) # print out the checkcode list

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