|
3 | 3 | This repository describes some of the tips and tricks for using the Python programming |
4 | 4 | language. |
5 | 5 |
|
6 | | -## Running Python Scripts |
7 | | - |
8 | | -```bash |
9 | | -python <script name> |
10 | | -``` |
11 | | - |
12 | | -Replace "<script name>" with the file name of the Python script that you want to run. |
13 | | - |
14 | | -## Declare Variables |
15 | | - |
16 | | -Variables hold the values that are used in your application or script. In Python, |
17 | | -variables are not strong-typed. This means that the variables you declare, |
18 | | -are not limited to a particular data type. However, the variable does have a |
19 | | -value, any future changes to that value must be of the same type. So you cannot set |
20 | | -the value of a variable to a string and then change it to a integer. |
21 | | - |
22 | | -```python |
23 | | -myVariable = "red" |
24 | | -myOtherVariable = false |
25 | | -myOtherOtherVariable = 5 |
26 | | -``` |
27 | | - |
28 | | -## Functions |
29 | | - |
30 | | -To write a function in Python, you start the function out with the "def" keyword. |
31 | | - |
32 | | -### Example |
33 | | - |
34 | | -```python |
35 | | -def myFunction (param1, param2, param3): |
36 | | - sum = param1 + param2 + param3 |
37 | | - return sum |
38 | | -``` |
39 | | - |
40 | | -If you notice, there are no braces or brackets around the contents of the function. |
41 | | -Python relies on indentation for the grouping of lines together within a given |
42 | | -section. |
43 | | - |
44 | | -## Random Number |
45 | | - |
46 | | -Random nubmers can be used to do countdowns or other things that are needed. |
47 | | -To get a random number, you have to import the randomint class from the random library |
48 | | -by adding |
49 | | - |
50 | | -```python |
51 | | -from random import randint |
52 | | -``` |
53 | | - |
54 | | -to the top of your Python script. |
55 | | - |
56 | | -Then you can set the random integer to a variable by doing |
57 | | - |
58 | | -```python |
59 | | -myNumber = randint(5,60) |
60 | | -``` |
61 | | - |
62 | | -In the example above, 5 is the lower limit of the range and 60 is the upper limit |
63 | | -of the range. If your range needs to be different, then changes either or both of |
64 | | -these values. |
65 | | - |
66 | | -## Basic Mathematics |
67 | | - |
68 | | -### Addition |
69 | | - |
70 | | -To do addition in Python, just have to code out two numbers and add them together |
71 | | -like you would normally do for a math problem that you were writing on paper. Just |
72 | | -keep in mind that the calculations always have to be done on the right side of the |
73 | | -equals sign and will be set to the variable on the left of the equals sign. |
74 | | - |
75 | | -```python |
76 | | -sum = 5 + 3 |
77 | | -print sum |
78 | | -``` |
79 | | - |
80 | | -From the example above, the output will print 8. |
81 | | - |
82 | | -### Subtraction |
83 | | - |
84 | | -Similar in fashion, subtraction is written just like addition, except it uses the |
85 | | -minus sign instead of the plus sign. |
86 | | - |
87 | | -```python |
88 | | -difference = 10 - 3 |
89 | | -print difference |
90 | | -``` |
91 | | - |
92 | | -From the example above, the output will print 7. |
93 | | - |
94 | | -### Multiplication |
95 | | - |
96 | | -Multiplication is done using the asterisk. |
97 | | - |
98 | | -```python |
99 | | -product = 4 * 3 |
100 | | -print product |
101 | | -``` |
102 | | - |
103 | | -From the example above, the output will print 12. |
104 | | - |
105 | | -### Division |
106 | | - |
107 | | -```python |
108 | | -quotient = 20 / 5 |
109 | | -print quotient |
110 | | -``` |
111 | | - |
112 | | -From the example above, the output will print 4. |
113 | | - |
114 | | -## More Resources |
115 | | - |
116 | | -The Raspberry Pi traffic light project is written in Python code. You can review the |
117 | | -code at |
118 | | -[https://github.com/almostengr/raspitraffic-stem](https://github.com/almostengr/raspitraffic-stem). |
119 | | - |
| 6 | +Information listed previous in this repository has been moved to |
| 7 | +[my website](http://thealmostengineer.com/resources/python-cheatsheet). |
| 8 | +You can also view the information |
| 9 | +[on GitHub](https://github.com/almostengr/almostengrwebsite/blob/master/docs/resources/python-cheatsheet.md). |
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