""" Purpose: introduce some another function from module random
"""

# by default the random module produces different interactions everytime we use it

import random    # random is another python library that must be imported
# without providing a seed, the seed to set the random machine depends on the current time
# and time is always increasing, so the random machine will be reset every new time

# seed() is a function in random
# pass in ANYTHING --> it will set the random machine into a certain state
#   the seed can be a number (ints, floats), string, lists,...
# so then every time you run the program, it will choose the same randomness regardless of the run
# of the program and regardless of your computer
# if you pass nothing into the function, the seed will be the current time, so will be random every time you run
# the program (the same as not using the seed() function at all)
random.seed('1112')
# '1112' is a different seed than number 1112 --> produce different random choices

# you don't need to know how a random machine works - it's just a black box --> just know it produces
# random things and choices

# random function choice( seq ) when a given a sequence as a parameter returns
# a random element from the sequence

### get a string and choose four of its characters (repetition allowed)
s = input( "Enter a string: " )

# random.choice( s ) --> function in random where you can give it a string, it gives you a random character
# from that string
# this will be random choice every time you run it, and different on each computer
# each use of the choice function will produce a random choice for a character within the string s
# two random choices may be the same
i1 = random.choice( s )
i2 = random.choice( s )
i3 = random.choice( s )
i4 = random.choice( s )

# if seed is set to random.seed('1112')
# choice will choose a random string but it will be the same choice everytime you run the program
# let s = 'abcdefghij'
# so i1 may choose 'j' from s, i2 may choose 'f'
# and these choices will be the same even if you rerun the program
# if seed is not set, then when you rerun the program, i1, i2, i3 and so on will have different choices

print ()

print( "Four random characters from string", s, ": ", i1, i2, i3, i4 )

print ()

### get a list of words and choose four (repetition allowed)
reply = input( "Enter some words: " )

user_words  = reply.split()
# can also pass in a list into random.choice( list ) and it will hand back a random element from the list
w1 = random.choice( user_words )
w2 = random.choice( user_words )
w3 = random.choice( user_words )
w4 = random.choice( user_words )

print( "Four random words from list", user_words, ":",  w1, w2, w3, w4 )