Writing Functions and Importing Custom/System Functions

 

                    Writing Functions and Importing Custom/System Functions

# writing custom function to find index 

print('Imported testp...')

def find_index(to_search, target):
    '''Find the index of a value in a sequence'''
    for i, value in enumerate(to_search):
        if value == target:
            return i

    return -1



# Import sys module and printing all System Path.

import sys
print(sys.path)

# Import OS module and print location of file where the function is defined.

import os
print(os.__file__)

Comparisons and Loops with break/Continue

# Comparisons:


# Equal:            ==
# Not Equal:        !=
# Greater Than:     >
# Less Than:        <
# Greater or Equal: >=
# Less or Equal:    <=
# Object Identity:  is



Break statement :

nums = [1,2,3,4,5] for num in nums: if num == 2: ### Here we are breaking out of while loop when num is equal to 2, output will only be 1 break print(num) num += 1
Continue statement : nums = [1,2,3,4,5] for num in nums: if num == 2: ### Here we are passing off when num is equal to 2, so output is 1,3,4,5 continue print(num) num += 1

List, Tuples, Set and Dictionary

                                          List, Tuples, Set and Dictionary

# Empty Lists - Mutable
empty_list = []
empty_list = list()

# Empty Tuples - Immutable
empty_tuple = ()
empty_tuple = tuple()

# Empty Sets - throw away duplicates or membership test
empty_set = set()

# Empty Dict - Key Value pairs

empty_dict = {} # This isn't right! It's a dict

Examples  
list_1 = ['History', 'Math', 'Physics', 'CompSci']
print(list_1)

Update list
list_1[0] = 'Art'


#tuple
tuple_1 = ('History', 'Math', 'Physics', 'CompSci')

print(tuple_1)
# Sets
cs_courses = {'History', 'Math', 'Physics', 'CompSci'}

print(cs_courses)

# Dictionary
student = {'name': 'John', 'age': 25, 'courses': ['Math', 'CompSci']}

for key, value in student.items():
    print(key, value)

Python String formatting

                                       Python String formatting

                                             

  Formatting string in python can be achieved via different ways as below.

Declaring variables :

greeting = 'Hello'

name = 'Abizer'

morninggreeting = 'Morning !'

Concatenating string (Default and easy when not many strings need to be Concatenated)

message =  greeting + ", " + name + "." + morninggreeting

Formatting strings via below method to make it more readable.

message =  '{}, {}.{}'.format(greeting, name, morninggreeting)

If your using 3.6+ version of Python we can use f strings to achieve same thing

message = f'{greeting}, {name}.{morninggreeting}'

Finally print the output.

print(message)

Output :

Hello, Abizer.Morning !