# Random numbers in Python

Python Methods and Functions

Operations with Randon's numbers:

1. choice () : — This function is used to generate 1 random number from a container.

2. randrange (beg, end, step) : — This function is also used to generate a random number, but within the range specified in its arguments.  This function takes 3 arguments: start number (included in generation), last number (excluded during generation) and step (to skip numbers in the range when selected).

 ` # Python code to demonstrate how it works ` ` # choice () and randrange () `   ` # importing "random" for random operations ` ` import ` ` random `   ` # using choice () to generate a random number from ` ` # a list of numbers is given. ` ` print ` ` (` ` " A random number from list is: "` `, end ` ` = ` `" ") ` ` print ` ` (random.choice ([` ` 1 ` `, ` ` 4 ` `, ` ` 8 ` `, ` ` 10 ` `, ` ` 3 ` `])) `   ` # using randra nge () to generate in the range 20 ` ` # up to 50. The last parameter 3 is the step size to be skipped ` ` # three numbers if selected. ` ` print ` ` (` ` "A random number from range is:" ` `, end ` ` = ` ` "") ` ` print ` ` (random.randrange (` ` 20 ` `, ` ` 50 ` `, ` ` 3 ` `)) `

Output:

` A random number from list is: 4 A random number from range is: 41 `

3. random () : — This number is used to generate a random number with a floating point less than 1 and greater than or equal to 0.

4. seed () : — This function displays a specific random number with the specified seed . All random numbers called after the seeded value will return the matched number.

 ` # Python code to demonstrate how it works ` ` # random () and seed () `   ` # import & quot; random & quot; for random operations ` ` import ` ` random `   ` # using random () to generate a random number ` ` # from 0 up to 1 ` ` print ` ` (` ` "A random number between 0 and 1 is: "` `, end ` ` = ` `" ") ` ` print ` ` (random.random ()) `   ` # using seed () to fill in a random number ` ` random.seed (` ` 5 ` `) ` ` `  ` # prints the displayed random number ` ` print ` ` (` `" The mapped random number with 5 is: "` `, end ` ` = ` ` "") ` ` print ` ` (random.random ()) `   ` # using seed () to seed another random number ` ` random.seed (` ` 7 ` `) `   ` # print the displayed random number ` ` print ` ` (` ` "The mapped random number with 7 is:" ` `, end ` ` = ` ` "") ` ` print ` ` (random.random ()) ` ` `  ` # using seed () to seed again to 5 ` ` random.seed (` ` 5 ` `) ` ` `  ` # print the displayed random number ` ` print ` ` (` ` "The mapped random number with 5 is:" ` `, end ` ` = ` ` "") ` ` print ` ` (random.random ()) ` ` `  ` # using seed ( ) seed again to 7 ` ` random.seed (` ` 7 ` `) ` ` `  ` # prints the displayed random number < / code> `` print ( "The mapped random number with 7 is: " , end = " ") print (random.random ()) `

Output:

` A random number between 0 and 1 is: 0.510721762520941 The mapped random number with 5 is: 0.6229016948897019 The mapped random number with 7 is: 0.32383276483316237 The mapped random number with 5 is: 0.6229016948897019 The mapped random number with 7 is: 0.32383276483316237 `

5. shuffle () : — this function is used to shuffle the entire list, to randomly arrange them.

6.iform (a, b) : — this function is used to generate a random number with a floating point between the numbers given in its arguments.  It takes two arguments: a lower limit (included in generation) and an upper limit (not included in generation).

 ` # Python- demo code ` ` # shuffle () and uniform () `   ` # importing "random" for random operations ` ` import ` ` random `   ` # Initializing list ` ` li ` ` = ` ` [` ` 1 ` `, ` ` 4 ` `, ` ` 5 ` `, ` ` 10 ` `, ` ` 2 ` ` ] `   ` # Print list before shuffling ` ` print ` ` (` ` "The list before shuffling is:" ` `, end ` ` = ` ` "") ` ` for ` ` i ` ` in ` ` range ` ` (` ` 0 ` `, ` ` len ` ` (li)): ` ` print ` ` (li [i], end ` ` = ` ` "" ` `) ` ` print ` ` (` ` "" ` `) `   ` # using shuffle () to shuffle the list ` ` random.shuffle (li) `   ` # Print the list after shuffling ` ` print ` ` (` ` "The list after shuffling is:" ` `, end ` ` = ` ` "") ` ` for ` ` i ` ` in ` ` range ` ` (` ` 0 ` `, ` ` len ` ` (li)): ` ` print ` ` (li [i], end ` ` = ` ` "" ` `) ` ` print ` ` (` `" "` `) ` ` `  ` # using uniform () to generate a random floating point number in a range ` ` # prints a number from 5 to 10 ` ` print ` ( ` "The random floating point number between 5 and 10 is:" ` `, end ` ` = ` ` "") ` ` print ` ` (random.uniform (` ` 5 ` `, ` ` 10 ` `)) `

Output:

` The list before shuffling is: 1 4 5 10 2 The list after shuffling is: 2 1 4 5 10 The random floating point number between 5 and 10 is: 5.183697823553464 `

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