This blog is all about top 7 tips to improve your python programming.
1. Make use of inbuilt functions.
2. Write readable code with proper comments and documentation.
3. Follow PEP8 style guide and avoid common mistakes like variable name should be lowercase, function names should be written in lower case and words are separated by underscore e.g. def my_function(). Also use descriptive variable names.
4. Try to avoid the global variables as much as possible as it makes code difficult to debug and maintain.
5. Avoid single letter variable names except for counters or iterators or temp variables, else it will make code harder to read and understand for others or even for yourself after a period of time.
6. Use list comprehensions instead of a sequence of append() calls for simple tasks as list comprehensions are more pythonic way and easy to read, it also results in better performance than traditional loops for large lists, but try to avoid list comprehensions for complex tasks as it may lead to bugs due to its conciseness, then go with traditional loops instead of list comprehensions because readability matters a lot when it comes to complex tasks.
7. Always write clean, simple and readable code because that always pays off
The following code is to calculate the factorial of any given number. The code is written in python.
def factorial(x):
if x == 0:
return 1
return x * factorial(x – 1)
print (factorial(5))
import math
print(“math.factorial(5): “, math.factorial(5))
print(“math.factorial(8): “, math.factorial(8))
print(“math.factorial(10): “, math.factorial(10))
The factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example,
5! = 5 * 4 * 3 * 2 * 1 = 120
The value of 0! is 1, according to the convention for an empty product.
Factorials are used in combinatorics, probability, and mathematical induction.
In this tutorial, we will write a Python program to calculate the factorial of a number using a recursive function.
n=int(input(“Enter number:”))
fact=1
while (n>0):
fact=fact*n
n=n-1
print(“Factorial of the number is: “)
print(fact)
We can define the factorial of a number as the product of all numbers from 1 up to and including that number. For example, the factorial of 5 is 120:
5! = 5*4*3*2*1 = 120
We can write a program in Python to calculate this for us. Python has two ways to get input from a user: input() and raw_input(). The difference between these two functions is that raw_input() will try and return a string, whereas input() will evaluate the expression received from the user. So if we want the user to enter an integer, we should use raw_input(), but if we want the user to enter a mathematical expression, we should use input().
Factorials are a classic example of a recursive function. Here’s how it works:
• Factorials are the product of all positive integers less than or equal to n.
• 0! is defined to equal 1 (i.e., 1*2*3…*n = 0), and n! is undefined for negative n (i.e., -1*-2*-3…*n = ?).
• The factorial function can be expressed as a recursive function:
def fact(n):
if n == 0:
return 1
else:
return n * fact(n-1)