## randrange() in Python

Generating a random number has always been an important application and having many uses in daily life. Python offers a function that can generate random numbers from a specified range and also allowing rooms for steps to be included, called **randrange()** in **random** module. More to this function is discussed in this article.

Syntax :random.randrange(start(opt),stop,step(opt))Parameters :start(opt) :Number consideration for generation starts from this, default value is 0. This parameter is optional.stop :Numbers less than this are generated. This parameter is mandatory.step(opt) :Step point of range, this won't be included. This is optional. Default value is 1.Return Value :This function generated the numbers in the sequence start-stop skipping step.Exceptions :Raises ValueError ifstop <= startand number isnon- integral.

- Python3

`# Python code to demonstrate the working of` `# randrange()` `import` `random` `# Using randrange() to generate numbers from 0-100` `print` `(` `"Random number from 0-100 is : "` `,end` `=` `"")` `print` `(random.randrange(` `100` `))` `# Using randrange() to generate numbers from 50-100` `print` `(` `"Random number from 50-100 is : "` `,end` `=` `"")` `print` `(random.randrange(` `50` `,` `100` `))` `# Using randrange() to generate numbers from 50-100` `# skipping 5` `print` `(` `"Random number from 50-100 skip 5 is : "` `,end` `=` `"")` `print` `(random.randrange(` `50` `,` `100` `,` `5` `))` |

Output:

Random number from 0-100 is : 26 Random number from 50-100 is : 58 Random number from 50-100 skip 5 is : 90

**Exceptions**

**1. Value Error – Floating point value **

- Python3

`# Python code to demonstrate the Exception of` `# randrange(), ValueError, Float value` `import` `random` `# Using randrange() to generate numbers from 14.5-100` `# Raises Exception` `print` `(` `"Random number from 14.5-100 is : "` `,end` `=` `"")` `print` `(random.randrange(` `14.5` `,` `100` `))` |

Output :

Random number from 14.5-100 is :

Runtime Error :

Traceback (most recent call last): File "/home/5e40f42505a6926d0c75a09bec1279d9.py", line 9, in print (random.randrange(14.5,100)) File "/usr/lib/python3.5/random.py", line 182, in randrange raise ValueError("non-integer arg 1 for randrange()") ValueError: non-integer arg 1 for randrange()

2. **Value Error – start >= stop **

- Python3

`# Python code to demonstrate the Exception of` `# randrange(), ValueError, start >= start` `import` `random` `# Using randrange() to generate numbers from 500-100` `# Raises Exception` `print` `(` `"Random number from 500-100 is : "` `,end` `=` `"")` `print` `(random.randrange(` `500` `,` `100` `))` |

Output :

Random number from 500-100 is :

Runtime Error :

Traceback (most recent call last): File "/home/ea327cf3f1dd801a66a185d101c5cb13.py", line 9, in print (random.randrange(500,100)) File "/usr/lib/python3.5/random.py", line 196, in randrange raise ValueError("empty range for randrange() (%d,%d, %d)" % (istart, istop, width)) ValueError: empty range for randrange() (500,100, -400)

**Practical Application**

Generating random numbers has always been an important application and has been used in **many casino games, for gambling for many kid games** like ludo, etc which use the concept of Dice. **A short game, on who reaches 100 first wins have been depicted in the code below. Each player is allowed a dice of 1-10 numbers, i.e at each turn 1-10 can be attained.**.

- Python3

`# Python code to demonstrate the Application of` `# randrange()` `import` `random` `sum` `=` `0` `sum1 ` `=` `0` `count ` `=` `0` `flag ` `=` `0` `while` `(` `1` `):` ` ` ` ` `# generate random number at each turn 1-10` ` ` `r1 ` `=` `random.randrange(` `1` `,` `10` `)` ` ` `r2 ` `=` `random.randrange(` `1` `,` `10` `)` ` ` ` ` `# adding to account of players` ` ` `sum` `=` `sum` `+` `r1` ` ` `sum1 ` `=` `sum1 ` `+` `r2` ` ` `count ` `=` `count` `+` `1` ` ` ` ` `print` `(` `"Total score of Player 1 after turn %d is : %d "` `%` `(count,` `sum` `))` ` ` ` ` `# break when player 1 reaches 100` ` ` `if` `(` `sum` `>` `=` `100` `):` ` ` `flag` `=` `1` ` ` `break` ` ` `print` `(` `"Total score of Player 2 after turn %d is : %d"` `%` `(count,sum1))` ` ` ` ` `# break when player 2 reaches 100` ` ` `if` `(sum1>` `=` `100` `):` ` ` `flag` `=` `2` ` ` `break` `if` `(flag` `=` `=` `1` `):` ` ` `print` `(` `"\nPlayer 1 wins the game"` `)` `else` `:` ` ` `print` `(` `"\nPlayer 2 wins the game"` `) ` |

**Output**

Total score of Player 1 after turn 1 is : 8 Total score of Player 2 after turn 1 is : 4 Total score of Player 1 after turn 2 is : 13 Total score of Player 2 after turn 2 is : 8 Total score of Player 1 after turn 3 is : 22 Total score of Player 2 after turn 3 is : 16 Total score of Player 1 after turn 4 is : 28 Total score of Player 2 after turn 4 is : 22 Total score of Player 1 after turn 5 is : 33 Total score of Player 2 after turn 5 is : 27 Total score of Player 1 after turn 6 is : 35 Total score of Player 2 after turn 6 is : 33 Total score of Player 1 after turn 7 is : 36 Total score of Player 2 after turn 7 is : 42 Total score of Player 1 after turn 8 is : 38 Total score of Player 2 after turn 8 is : 50 Total score of Player 1 after turn 9 is : 45 Total score of Player 2 after turn 9 is : 55 Total score of Player 1 after turn 10 is : 48 Total score of Player 2 after turn 10 is : 61 Total score of Player 1 after turn 11 is : 54 Total score of Player 2 after turn 11 is : 64 Total score of Player 1 after turn 12 is : 57 Total score of Player 2 after turn 12 is : 70 Total score of Player 1 after turn 13 is : 66 Total score of Player 2 after turn 13 is : 73 Total score of Player 1 after turn 14 is : 72 Total score of Player 2 after turn 14 is : 75 Total score of Player 1 after turn 15 is : 79 Total score of Player 2 after turn 15 is : 76 Total score of Player 1 after turn 16 is : 81 Total score of Player 2 after turn 16 is : 77 Total score of Player 1 after turn 17 is : 89 Total score of Player 2 after turn 17 is : 81 Total score of Player 1 after turn 18 is : 95 Total score of Player 2 after turn 18 is : 90 Total score of Player 1 after turn 19 is : 97 Total score of Player 2 after turn 19 is : 99 Total score of Player 1 after turn 20 is : 102 Player 1 wins the game

This article is contributed by **Manjeet Singh**. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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Last Updated on March 1, 2022 by admin