playforge python class

notes.txt

# numbers
>>> 1
1
>>> 1 + 1
2
>>> 1 - 5
-4
>>> 8 * 9
72
>>> 4 / 2
2
>>> 5 / 2
2
>>> 2.5
2.5
>>> type(5/2)
<type 'int'>
>>> type(2.5)
<type 'float'>
>>> 5.0 / 2
2.5
>>> 6 ** 7
279936
>> 5 % 2
1
>> 5 + 90 * 7 - 4 / 2
633


# boolean
>>> True
True
>>> False
False
>>> if True:
...     7
...
7
>>> if False:
...     7
...
>>> if False:
...     7
... else:
...     8
...
8
>>> if False:
...     7
... elif False:
...     8
... elif False:
...     9
... else:
...     10
...
10
>>> 7 < 8
True
>>> 7 <= 8
True
>>> 7 == 8
False
>>> 7 != 8
True
>>> 7 > 8
False
>>> 7 >= 8
False
>>> if 7 < 8:
...     9
...
9
>>> not False
True
>>> not True
False
>>> True or False
True
>>> True and False
False


# strings
>>> "hello"
'hello'
>>> print "hello"
hello
>>> print "hello", "jello"
hello jello
>>> print "hello", 3, None, "rules"
hello 3 None rules
>>> "hello" == "jello"
False
>>> "hello" == "hello"
True
>>> 'h' in "hello"
True
>>> 'j' in "hello"
False
>>> "h" in "hello"
True
>>> "j" in "hello"
False
>>> "hell" in "hello"
True
>>> "hello" + "hello"
'hellohello'
>>> "hello" - "hello"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for -: 'str' and 'str'
>>> "hello" + "hello" + "hello"
'hellohellohello'
>>> "hello" * 3
'hellohellohello'
>>> "hello" / 3
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for /: 'str' and 'int'


# lists
>>> []
[]
>>> [None, 1, 2, -4, 7.0, True, False, 7 < 8, "hello", "hello" + "there", []]
[None, 1, 2, -4, 7.0, True, False, True, 'hello', 'hellothere', []]
>>> [1,2,3][0]
1
>>> [1,2,3][1]
2
>>> [1,2,3][-1]
3
>>> 3 in [1,2,3]
True
>>> 4 in [1,2,3]
False
>>> [1,2,3] + 4
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can only concatenate list (not "int") to list
>>> [1,2,3] + [4]
[1, 2, 3, 4]
>>> [1,2,3] * 3
[1, 2, 3, 1, 2, 3, 1, 2, 3]

# assignment
>>> value = [1,2,3]
>>> value
[1, 2, 3]
>>> eight = 8
>>> eight * 7
56
>>> people_in_room = 8
>>> people_in_room = people_in_room + 1
>>> people_in_room
9
>>> tw_devs = ["Jeff", "Niels", "Nick"]
>>> for dev in tw_devs:
...     print dev, "is awesome"
...
Jeff is awesome
Niels is awesome
Nick is awesome

# functions
>>> def make_awesome(name):
...     return name + " is awesome"
...
>>> make_awesome("Tami")
'Tami is awesome'
>>> [make_awesome]
[<function make_awesome at 0x10041bcf8>]

# wallet
>>> wallet = 500