Colab 

pics = ["1.jpg", "2.jpg", "3.jpg", "4.jpg", "7.jpg", "5.jpg", "9.jpg", "8.jpg", "10.jpg", "11.jpg"]


pics.sort()


pics


['1.jpg', '2.jpg', '3.jpg', '4.jpg', '5.jpg', '7.jpg', '8.jpg', '9.jpg']

list(reversed(pics))


['9.jpg', '8.jpg', '7.jpg', '5.jpg', '4.jpg', '3.jpg', '2.jpg', '1.jpg']

pics


['1.jpg', '2.jpg', '3.jpg', '4.jpg', '7.jpg', '5.jpg', '9.jpg', '8.jpg']

sortedpics = sorted(pics)


sortedpics



['1.jpg', '2.jpg', '3.jpg', '4.jpg', '5.jpg', '7.jpg', '8.jpg', '9.jpg']

pics


['1.jpg', '2.jpg', '3.jpg', '4.jpg', '7.jpg', '5.jpg', '9.jpg', '8.jpg']

pics.sort()


pics


['1.jpg', '2.jpg', '3.jpg', '4.jpg', '5.jpg', '7.jpg', '8.jpg', '9.jpg']

pics


['1.jpg',
 '10.jpg',
 '11.jpg',
 '2.jpg',
 '3.jpg',
 '4.jpg',
 '5.jpg',
 '7.jpg',
 '8.jpg',
 '9.jpg']

pics = [name.split('.')[0] for name in pics]


pics


['1', '10', '11', '2', '3', '4', '5', '7', '8', '9']

def str_to_num(s):
    return int(s)


str_to_num(pics[2])


11

'11' < '2'


True

11 > 2


True

sorted(pics, key=str_to_num)


['1', '2', '3', '4', '5', '7', '8', '9', '10', '11']

int('11')


11

sorted(pics, key=int)


['1', '2', '3', '4', '5', '7', '8', '9', '10', '11']

pics


['1', '10', '11', '2', '3', '4', '5', '7', '8', '9']

bank_customers = [
    { "name": "aviad", "tel": "053", "id" : "0358"},
    { "name": "moshe", "tel": "054", "id" : "0123"},
    { "name": "david", "tel": "055", "id" : "456"}
]


def name_from_customer(customer):
    """
    { "name": "aviad", "tel": "053", "id" : "0358"},
    """
    return customer["name"]


sorted(bank_customers, key=name_from_customer)


[{'name': 'aviad', 'tel': '053', 'id': '0358'},
 {'name': 'david', 'tel': '055', 'id': '456'},
 {'name': 'moshe', 'tel': '054', 'id': '0123'}]

def id_from_customer(customer):
    """
    { "name": "aviad", "tel": "053", "id" : "0358"},
    """
    return customer["id"]


sorted(bank_customers, key=id_from_customer)


[{'name': 'moshe', 'tel': '054', 'id': '0123'},
 {'name': 'aviad', 'tel': '053', 'id': '0358'},
 {'name': 'david', 'tel': '055', 'id': '456'}]

pics


['1', '10', '11', '2', '3', '4', '5', '7', '8', '9']

sorted(pics, key=int, reverse=True)


['11', '10', '9', '8', '7', '5', '4', '3', '2', '1']

"the quick brown fox jumped over the lazy dog".split()[1:].index("the")


5

"helo".find("e")


1

"the quick brown fox jumped over the lazy dog".split().