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# -*- coding: utf-8 -*-

"""

Created on Mon Dec 6 11:26:56 2021

@author: mjach

"""

'''

Generator Expression

- it is a iterable object - like list, set , dictionary

- generator works on demand basis unlike a list which iterate elements all at once

- generator expression looks like list comprehensions just differnce generator use parenthesis where list comprehensions use brackets

- generator are useful for large set of list without storting the entire list in memory

'''

#example 1 - list comprehension

# fruit_names = ['apple', 'banana', 'orange']

# list_comprehension = [('Length = ', len(fruitName)) for fruitName in fruit_names]

# print(list_comprehension)

# example 2 - generator expression

# fruit_names = ['apple', 'banana', 'orange']

# generator_expression = (('Length = ', len(fruitName)) for fruitName in fruit_names)

# print(generator_expression)

# for fruit in generator_expression:

# print(fruit)

# example 3

import timeit

# list_com = '[number for number in range(0,5 ** 11)]'

# print(timeit.timeit(list_com, number =1))

# generator_expression = '[number for number in range(0,5 ** 11)]'

# print(timeit.timeit(generator_expression, number =1))

generator_expression = [number for number in range(0,5 ** 11)]

print(timeit.timeit(lambda:generator_expression, number =1))

#https://stackoverflow.com/questions/54135771/timeit-valueerror-stmt-is-neither-a-string-nor-callable