Last change
on this file since 2302 was
1636,
checked in by Malte Marquarding, 15 years ago
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Added sphinx project for ASAP tutorials
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File size:
1.9 KB
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1 | ==================== |
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2 | Python in 20 minutes |
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3 | ==================== |
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4 | |
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5 | .. sectionauthor:: Malte Marquarding |
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6 | |
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7 | **Main goal:** To get a basic understanding of the python programming language |
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8 | |
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9 | |
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10 | This is a very quick introduction to the python programming language to get started with ASAP, |
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11 | which behaves just like any other python module you can find. |
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12 | It introduces basic programming concepts. |
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13 | |
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14 | |
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15 | Variables |
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16 | ========= |
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17 | |
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18 | A variable is just an alias/handle to a value. The value can be anything understood by python |
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19 | |
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20 | Example:: |
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21 | |
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22 | # an integer |
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23 | x = 1 |
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24 | # a string |
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25 | y = 'Hello World!' |
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26 | # a boolean |
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27 | z = True |
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28 | # list of ... |
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29 | a = [0, 1, 2] |
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30 | b = ['a', 'b'] |
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31 | |
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32 | |
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33 | Syntax |
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34 | ====== |
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35 | |
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36 | Python uses **identation** to define blocks, where other proogramming language often use |
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37 | curly brackets, e.g.: |
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38 | |
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39 | in *c*: |
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40 | |
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41 | .. code-block:: c |
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42 | |
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43 | while (i<10) { |
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44 | j += il |
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45 | } |
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46 | // block ends |
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47 | |
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48 | in *python*: |
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49 | |
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50 | .. code-block:: python |
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51 | |
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52 | while i<10: |
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53 | j += 10 |
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54 | # block ends |
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55 | |
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56 | |
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57 | Functions |
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58 | ========= |
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59 | |
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60 | When you need to repeat common behaviour you are better of defining a function, just like it would be |
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61 | in mathematics. A function can return something ot do no return anything but doing something implictly. |
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62 | |
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63 | Examples:: |
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64 | |
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65 | def squared(x): |
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66 | return x*x |
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67 | |
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68 | result = squared(2) |
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69 | print result |
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70 | |
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71 | def prefix_print(value): |
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72 | print 'My value:', value |
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73 | |
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74 | prefix_print('Hello') |
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75 | |
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76 | Statements |
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77 | ========== |
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78 | |
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79 | Often you find you will want to do something conditionally. |
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80 | For this you can use `if` statements. |
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81 | |
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82 | Example:: |
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83 | |
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84 | a = 1 |
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85 | if a == 1: |
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86 | print 'Match' |
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87 | else: |
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88 | |
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89 | print 'No match' |
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90 | |
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91 | To apply a function to a range of values you can use `for` or `while` |
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92 | |
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93 | Example:: |
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94 | |
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95 | i = 0 |
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96 | while i < 10: |
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97 | print i |
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98 | i +=1 |
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99 | |
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100 | for i in [0, 1, 2]: |
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101 | print i |
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102 | |
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103 | |
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104 | Objects |
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105 | ======= |
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106 | |
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107 | Objects are basically values with certain attributes, which are specific to that type of the object. |
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108 | For example strings in python have attribute functions which can perform operations on the string:: |
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109 | |
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110 | x = 'Test me' |
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111 | print x.upper() |
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