< Section 4<\/a> Control Flow allows us to execute specific blocks of code under specific conditions<\/p>\n https:\/\/www.udemy.com\/complete-python-bootcamp\/learn\/lecture\/9407960#content<\/a><\/p>\n These statements require a ‘:’ and white space (tabs)<\/p>\n Example<\/p>\n Feed me!<\/p>\n I’ll eat later.<\/p>\n Feed me!<\/p>\n I’ll eat later.<\/p>\n https:\/\/www.udemy.com\/complete-python-bootcamp\/learn\/lecture\/9407962#content<\/a><\/p>\n 1 S Hello Below we ‘unpack’ the tuple by assigning each index in the tuple to a variable.<\/p>\n <\/p>\n This only return the keys!!<\/p>\n k1 To get the key:value pairs:<\/p>\n (‘k1’, 1) To get JUST the values:<\/p>\n 1 1 1 https:\/\/www.udemy.com\/complete-python-bootcamp\/learn\/lecture\/9407964#content<\/a><\/p>\n 0 IndentationError: expected an indented block<\/p>\n done<\/p>\n S S https:\/\/www.udemy.com\/complete-python-bootcamp\/learn\/lecture\/9407966#content<\/a><\/p>\n range(start,stop,step)<\/p>\n 0 2 0 [0, 1, 2, 3, 4]<\/p>\n Index 0 = a (0, ‘a’) Index 0 = a Returns sets of tuples paired from multiple lists (1, ‘a’, ‘Thomas’) [(1, ‘a’, ‘Thomas’), (2, ‘b’, ‘Sofia’), (3, ‘c’, ‘Roberts’)]<\/p>\n False<\/p>\n True<\/p>\n True<\/p>\n True<\/p>\n False<\/p>\n True<\/p>\n 1<\/p>\n 4<\/p>\n This is an in place function and does not return anything.<\/p>\n [6, 3, 9, 2, 1, 8, 5, 10, 4, 7]<\/p>\n [4, 6, 2, 7, 5, 10, 8, 3, 9, 1]<\/p>\n randint(min, max)<\/p>\n 4<\/p>\n * Note: Input results are always strings!<\/p>\n What is your name? Sofia<\/p>\n ‘Sofia’<\/p>\n What is your favorite number? 24.7<\/p>\n str<\/p>\n 24.7<\/p>\n 24.7 24<\/p>\n What is your favorite number? 24.7 What is your favorite number? 24.7<\/p>\n 24<\/p>\n https:\/\/www.udemy.com\/complete-python-bootcamp\/learn\/lecture\/9407968#content<\/a><\/p>\n [‘S’, ‘o’, ‘f’, ‘i’, ‘a’]<\/p>\n Shortcut version<\/p>\n [‘S’, ‘o’, ‘f’, ‘i’, ‘a’]<\/p>\n [0, 1, 2, 3, 4]<\/p>\n [0, 1, 4, 9, 16]<\/p>\n [32.0, 50.0, 68.0, 94.1] [32.0, 50.0, 68.0, 94.1]<\/p>\n if<\/b><\/p>\n [0, 2, 4, 6, 8, 10] [0, ‘ODD’, 2, ‘ODD’, 4, ‘ODD’, 6, ‘ODD’, 8, ‘ODD’, 10]<\/p>\n [2, 20, 200, 4, 40, 400, 6, 60, 600]<\/p>\n
\nSection 6 ><\/a><\/p>\n\n
\n
if, elif and else Statements in Python<\/h1>\n
if some_condition_is_true:\r\n # execute some code that is indented\r\n # this line would execute as well\r\nelif previous_was_false_but_this_is_true:\r\n #execute different code\r\nelif both_above_are_false_but_this_is_true:\r\n # execute this block\r\n # of code\r\nelse:\r\n # execute this code if all conditions above are false<\/pre>\n
hungry = True\r\nif hungry:\r\n print(\"Feed me!\")\r\nelse:\r\n print(\"I'll eat later.\")<\/pre>\n
hungry = False\r\nif hungry:\r\n print(\"Feed me!\")\r\nelse:\r\n print(\"I'll eat later.\")<\/pre>\n
Note: Non 0 results are True, 0 results are False<\/h4>\n
hungry = 5\r\nif hungry:\r\n print(\"Feed me!\")\r\nelse:\r\n print(\"I'll eat later.\")<\/pre>\n
hungry = 0\r\nif hungry:\r\n print(\"Feed me!\")\r\nelse:\r\n print(\"I'll eat later.\")<\/pre>\n
for Loops in Python<\/h1>\n
\n
\n
\n
mylist = [1, 2, 3]\r\nfor value in mylist:\r\n print(value)<\/pre>\n
\n2
\n3<\/p>\nmyname = \"Sofia\"\r\nfor value in myname:\r\n print(value)<\/pre>\n
\no
\nf
\ni
\na<\/p>\nNote: You can use an underscore character for variable names you do not use<\/h4>\n
mylist = [1, 2, 3]\r\nfor _ in mylist:\r\n print('Hello')<\/pre>\n
\nHello
\nHello<\/p>\ntuple unpacking<\/h3>\n
mylist = [(1,2), (3,4), (5,6)]\r\nprint(len(mylist))\r\nfor value in mylist:\r\n print(value)\r\nfor a, b in mylist:\r\n print(f\"{a} and {b}\")<\/pre>\n3\r\n(1, 2)\r\n(3, 4)\r\n(5, 6)\r\n1 and 2\r\n3 and 4\r\n5 and 6<\/pre>\n
Note: The number of variables must match the tuple count or an error will occur!<\/h4>\n
mylist = [(1,2,3), (3,4), (5,6)]\r\nprint(len(mylist))\r\nfor value in mylist:\r\n print(value)\r\nfor a, b in mylist:\r\n print(f\"{a} and {b}\")<\/pre>\n3\r\n(1, 2, 3)\r\n(3, 4)\r\n(5, 6)\r\nValueError: too many values to unpack (expected 2)<\/pre>\n
for loops with dictionaries<\/h3>\n
Note: Keep in mind these are not ordered! There is no guarantee you’ll get your items back in the order you entered them!<\/h4>\n
mydict = {'k1': '1', 'k2': 2, 'k3':3}\r\nfor value in mydict:\r\n print(value)<\/pre>\n
\nk2
\nk3<\/p>\nmydict = {'k1': '1', 'k2': 2, 'k3':3}\r\nfor value in mydict.items():\r\n print(value)<\/pre>\n
\n(‘k2’, 2)
\n(‘k3’, 3)<\/p>\nmydict = {'k1': '1', 'k2': 2, 'k3':3}\r\nfor key, value in mydict.items():\r\n print(value)<\/pre>\n
\n2
\n3
\n…or use an underscore for the key variable…<\/p>\nmydict = {'k1': '1', 'k2': 2, 'k3':3}\r\nfor _, value in mydict.items():\r\n print(value)<\/pre>\n
\n2
\n3
\n…or use .values()<\/p>\nmydict = {'k1': '1', 'k2': 2, 'k3':3}\r\nfor value in mydict.values():\r\n print(value)<\/pre>\n
\n2
\n3<\/p>\nwhile Loops in Python<\/h1>\n
\n
\n
while some_condition:\r\n # do something\r\n # and continue to do it until the condition is false!\r\nelse:\r\n # do something else one time<\/pre>\n
Example<\/h3>\n
x = 0\r\nwhile x < 5:\r\n print(x)\r\n x += 1\r\nelse:\r\n print(f\"'{x}' is not less than 5!\")<\/pre>\n
\n1
\n2
\n3
\n4
\n‘5’ is not less than 5!<\/p>\nbreak, continue and pass<\/h2>\n
\n
\n
pass<\/h3>\n
x = [1,2,3]\r\nfor value in x:\r\n # nothing here\r\nprint('done')<\/pre>\nx = [1,2,3]\r\nfor value in x:\r\n pass\r\nprint('done')<\/pre>\ncontinue<\/h3>\n
name = 'Sophia'\r\nfor letter in name:\r\n if letter == 'p':\r\n print('f')\r\n continue\r\n elif letter == 'h':\r\n #don't print anything\r\n continue\r\n print(letter)<\/pre>\n
\no
\nf
\ni
\na<\/p>\nbreak<\/h3>\n
name = 'Sofia Roberts'\r\nfor letter in name:\r\n if letter == ' ':\r\n break\r\n print(letter)<\/pre>\n
\no
\nf
\ni
\na<\/p>\nUseful Operators in Python<\/h1>\n
range<\/h3>\n
for num in range(5):\r\n print(num)<\/pre>\n
\n1
\n2
\n3
\n4<\/p>\nfor num in range(2,5):\r\n print(num)<\/pre>\n
\n3
\n4<\/p>\nfor num in range(0,5,2):\r\n print(num)<\/pre>\n
\n2
\n4<\/p>\nCreate a list with range<\/h4>\n
x = list(range(5))\r\nprint(x)<\/pre>\n
enumerate<\/h3>\n
i = 0\r\nfor letter in 'abcde':\r\n print(f\"Index {i} = {letter}\")\r\n i += 1<\/pre>\n
\nIndex 1 = b
\nIndex 2 = c
\nIndex 3 = d
\nIndex 4 = e<\/p>\nfor item in enumerate('abcde'):\r\n print(item)<\/pre>\n
\n(1, ‘b’)
\n(2, ‘c’)
\n(3, ‘d’)
\n(4, ‘e’)<\/p>\nfor i, letter in enumerate('abcde'):\r\n print(f\"Index {i} = {letter}\")<\/pre>\n
\nIndex 1 = b
\nIndex 2 = c
\nIndex 3 = d
\nIndex 4 = e<\/p>\nzip<\/h3>\n
\n* Note: it stops pairing to the list with the smallest count.<\/p>\nmylist1 = [1, 2, 3, 4]\r\nmylist2 = ['a', 'b', 'c', 'd']\r\nmylist3 = ['Thomas', 'Sofia', 'Roberts']\r\nfor item in zip(mylist1, mylist2, mylist3):\r\n print(item)<\/pre>\n
\n(2, ‘b’, ‘Sofia’)
\n(3, ‘c’, ‘Roberts’)<\/p>\nlist(zip(mylist1, mylist2, mylist3))<\/pre>\n
in<\/h3>\n
mylist = ['Thomas', 'Sofia', 'Roberts']\r\n'Jim' in mylist<\/pre>\n
'Sofia' in mylist<\/pre>\n
'f' in \"Sofia\"<\/pre>\n
'k1' in {'k1': 123}<\/pre>\n123 in {'k1': 123}<\/pre>\n123 in {'k1': 123}.values()<\/pre>\nmin and max<\/h3>\n
mylist = [1, 2, 3, 4]\r\nmin(mylist)<\/pre>\n
max(mylist)<\/pre>\n
Random Library<\/h2>\n
shuffle<\/h3>\n
from random import shuffle\r\nmylist = [1,2,3,4,5,6,7,8,9,10]\r\nshuffle(mylist)\r\nmylist<\/pre>\n
shuffle(mylist)\r\nmylist<\/pre>\n
randint<\/h3>\n
from random import randint\r\nx = randint(0,10)\r\nx<\/pre>\n
Other Functions<\/h2>\n
input<\/h3>\n
name = input('What is your name? ')<\/pre>\nname<\/pre>\n
Convert input results to an int or float<\/h4>\n
number = input('What is your favorite number? ')<\/pre>\ntype(number)<\/pre>\n
float(number)<\/pre>\n
int(number)<\/pre>\n
\nValueError: invalid literal for int() with base 10: ‘24.7’<\/p>\nint(float(number))<\/pre>\n
Casting input values<\/h4>\n
number = int(input('What is your favorite number? '))<\/pre>\n
\nValueError: invalid literal for int() with base 10: ‘24.7’<\/p>\nnumber = int(float((input('What is your favorite number? ')))<\/pre>\nnumber<\/pre>\n
List Comprehensions in Python<\/h1>\n
\n
mystring = 'Sofia'\r\nmylist = []\r\nfor letter in mystring:\r\n mylist.append(letter)\r\nmylist<\/pre>\n
mylist = [letter for letter in mystring]\r\nmylist<\/pre>\n
mylist = [num for num in range(0,5)]\r\nmylist<\/pre>\n
mylist = [num**2 for num in range(0,5)]\r\nmylist<\/pre>\n
fahrenheit = [ (9\/5*temp+32) for temp in [0, 10, 20, 34.5])\r\nmylist<\/pre>\n
\nthis is the same as:<\/b><\/p>\nfahrenheit = []\r\nfor temp in [0, 10, 20, 34.5]:\r\n fahrenheit.append(9\/5*temp+32)\r\nfahrenheit<\/pre>\n
Using if, else statements<\/h4>\n
mylist = [num for num in range(0,11) if num%2==0]\r\nmylist<\/pre>\n
\nif else<\/b>
\nNotice the order is reversed!<\/p>\nmylist = [num if num%2==0 else 'ODD' for num in range(0,11)]\r\nmylist<\/pre>\n
Nested for loops<\/h2>\n
mylist = [x * y for x in [2, 4, 6] for y in [1, 10, 100]]\r\nmylist<\/pre>\n
Python Statements Test Overview<\/h1>\n