20 |
20 |
21 .. Author : Anoop Jacob Thomas <anoop@fossee.in> |
21 .. Author : Anoop Jacob Thomas <anoop@fossee.in> |
22 Internal Reviewer : Nishanth |
22 Internal Reviewer : Nishanth |
23 Internal Reviewer(2): Amit |
23 Internal Reviewer(2): Amit |
24 External Reviewer : |
24 External Reviewer : |
|
25 Language Reviewer : Bhanukiran |
25 Checklist OK? : <put date stamp here, if OK> [2010-10-05] |
26 Checklist OK? : <put date stamp here, if OK> [2010-10-05] |
26 |
27 |
27 |
28 |
28 ============================= |
29 ============================= |
29 Getting started with for loop |
30 Getting started with for loop |
30 ============================= |
31 ============================= |
31 |
32 |
32 {{{ show welcome slide }}} |
33 {{{ show welcome slide }}} |
33 |
34 |
34 Hello and welcome to the tutorial getting started with ``for`` loop. |
35 Hello and welcome to the tutorial `Getting started with ``for`` loop`. |
35 |
36 |
36 {{{ switch to next slide, outline slide }}} |
37 {{{ switch to next slide, outline slide }}} |
37 |
38 |
38 In this tutorial we will learn about ``for`` loops in python, and also |
39 In this tutorial we will learn about ``for`` loops in python, and also |
39 learn how to write blocks of code in Python. |
40 learn how to write blocks of code in Python. |
154 |
155 |
155 {{{ highlight the fourth line - the line just after for loop }}} |
156 {{{ highlight the fourth line - the line just after for loop }}} |
156 |
157 |
157 it means that it is not part of the ``for`` loop and the lines after |
158 it means that it is not part of the ``for`` loop and the lines after |
158 that doesn't fall in the scope of the ``for`` loop. Thus each block is |
159 that doesn't fall in the scope of the ``for`` loop. Thus each block is |
159 separated by the indentation level. Thus marking the importance of |
160 separated by the indentation level and that marks the importance of |
160 white-spaces in Python. |
161 white-spaces in Python. |
161 |
162 |
162 {{{ switch to the slide which shows the problem statement of the first |
163 {{{ switch to the slide which shows the problem statement of the first |
163 problem to be tried out }}} |
164 problem to be tried out }}} |
164 |
165 |
202 |
203 |
203 print "Square root of", each, |
204 print "Square root of", each, |
204 print "is", sqrt(each) |
205 print "is", sqrt(each) |
205 |
206 |
206 Now we have finished the statements in the block, and still the |
207 Now we have finished the statements in the block, and still the |
207 interpreter is showing four dots, which means you are still inside the |
208 interpreter is showing four dots, this means that you are still inside the |
208 block. To exit from the block press return key or the enter key twice |
209 block. To exit from the block press the return key or the enter key twice |
209 without entering anything else. It printed the square root of each |
210 without entering anything else. It printed the square root of each |
210 number in the list, and that is executed in a ``for`` loop. |
211 number in the list, and that is executed in a ``for`` loop. |
211 |
212 |
212 {{{ switch to next slide, Indentation in ``python`` interpreter }}} |
213 {{{ switch to next slide, Indentation in ``python`` interpreter }}} |
213 |
214 |
250 Then say this list can also be generated using |
251 Then say this list can also be generated using |
251 the range function and hence introduce range. |
252 the range function and hence introduce range. |
252 |
253 |
253 {{{ switch to the next slide, ``range()`` function }}} |
254 {{{ switch to the next slide, ``range()`` function }}} |
254 |
255 |
255 Okay! so the main thing here we learned is how to use Python |
256 Okay! so the main thing that we learned here is how to use Python |
256 interpreter and IPython interpreter to specify blocks. But while we |
257 interpreter and IPython interpreter to specify blocks. But while we |
257 were generating the multiplication table we used something new, |
258 were generating the multiplication table we used something new, |
258 ``range()`` function. ``range()`` is an inbuilt function in Python |
259 ``range()`` function. ``range()`` is an inbuilt function in Python |
259 which can be used to generate a ``list`` of integers from a starting |
260 which can be used to generate a ``list`` of integers from a starting |
260 number to an ending number. Note that the ending number that you |
261 number to an ending number. Note that the ending number that you |