I am new to python pls help me write the correct code for these questions.

In In In In In 1. Write a fuction called 'fac' that takes an input of number N and output N!.Print the result as N! is result. For example, N = 5, N!=5*4*3*2*1 = 120. Print '5'. is120' 2. Make a plot for y = log(x), x is between 1 and 100. 3. Write a function called "operate" that takes as input two numbers, and a string that can be either "add" or "multiply". The output should be either the sum or product of the two numbers, depending on the string entered. 4. Write a function called "describe" that takes as input a list of numbers, and prints the number of elements in the list, and the mean, variance, and standard deviation. The printed quantities should be labeled. The output should look something like: number of elements: 12 mean: 0.5 variance: 0.04 standard deviation: 0.2 5. A simple substitution code codes 'a' as 1, 'b' as 2, ..., '2' as 25. Write a function called "encode" that takes in a string, and prints the coded text. The output should be a string, with letters separated by ".". Use \"999" for punctuation and spaces. For example, encode("Hello!") should print out "8.5.12.12.15.999"