64 |
64 |
65 As you can see, it displays a list of recent commands that we typed. Every |
65 As you can see, it displays a list of recent commands that we typed. Every |
66 command has a number in front, to specify in which order and when it was typed. |
66 command has a number in front, to specify in which order and when it was typed. |
67 |
67 |
68 Please note that there is a % sign before the hist command. This implies that |
68 Please note that there is a % sign before the hist command. This implies that |
69 %hist is a command that is specific to IPython and not available in vannila |
69 %hist is a command that is specific to IPython and not available in the vannila |
70 Python interpreter. These type of commands are called as magic commands. |
70 Python interpreter. These type of commands are called as magic commands. |
71 |
71 |
72 Also note that, the =%hist= itself is a command and is displayed as the most |
72 Also note that, the =%hist= itself is a command and is displayed as the most |
73 recent command. This implies that anything we type in is stored as history, |
73 recent command. We should not that anything we type in is stored as history, |
74 irrespective of whether it is command or an error or IPython magic command. |
74 irrespective of whether it is command or an error or IPython magic command. |
75 |
75 |
76 If we want only the recent 5 to be displayed, we pass the number as an argument |
76 If we want only the recent 5 commands to be displayed, we pass the number as an argument |
77 to =%hist= command. Hence |
77 to =%hist= command. Hence |
78 :: |
78 :: |
79 |
79 |
80 %hist 5 |
80 %hist 5 |
81 |
81 |
97 displays the commands from 5 to 10 |
97 displays the commands from 5 to 10 |
98 |
98 |
99 Now that we have the history, we would like to save the required line of code |
99 Now that we have the history, we would like to save the required line of code |
100 from history. This is possible by using the =%save= command. |
100 from history. This is possible by using the =%save= command. |
101 |
101 |
102 Before we do that, let us first look at history and identify what lines of code |
102 Before we do that, let us first look at history and identify what lines of code we require.Type |
103 we require.Type |
|
104 :: |
103 :: |
105 |
104 |
106 %hist |
105 %hist |
107 |
106 |
108 |
107 |
109 {{{ point to the lines }}} |
108 {{{ point to the lines }}} |
110 |
109 |
111 The first command is linspace. But second command is a command that gave us an |
110 The first command is linspace. But second command is a command that gave us an |
112 error. Hence we do not need seconf. The commands from third to sixth are |
111 error. Hence we do not need second command. The commands from third to sixth are |
113 required. The seventh command although is correct, we do not need it since we |
112 required. The seventh command although is correct, we do not need it since we |
114 are setting the title correctly in the eigthth command. |
113 are setting the title correctly in the eigthth command. |
115 |
114 |
116 So we need first third to sixth and the eigthth command for our program. |
115 So we need first third to sixth and the eigthth command for our program. |
117 Hence the syntax of =%save= is |
116 Hence the syntax of =%save= is |
152 We use the IPython magic command =%run= to do this. Type |
151 We use the IPython magic command =%run= to do this. Type |
153 :: |
152 :: |
154 |
153 |
155 %run -i /home/fossee/plot_script.py |
154 %run -i /home/fossee/plot_script.py |
156 |
155 |
157 The script runs but we do not see the plot. This happens because we are running |
156 The script runs but we do not see the plot. This happens because when we are running |
158 a script and we are not in interactive mode anymore. |
157 a script and we are not in interactive mode anymore. |
159 |
158 |
160 Hence on your terminal type |
159 Hence on your terminal type |
161 :: |
160 :: |
162 |
161 |
167 {{{ Pause here and try out the following exercises }}} |
166 {{{ Pause here and try out the following exercises }}} |
168 |
167 |
169 %% 3 %% Use %hist and %save and create a script that has show in it and run it |
168 %% 3 %% Use %hist and %save and create a script that has show in it and run it |
170 to produce and show the plot. |
169 to produce and show the plot. |
171 |
170 |
|
171 |
172 {{{ continue from paused state }}} |
172 {{{ continue from paused state }}} |
173 |
173 |
174 We first look at the history using |
174 We first look at the history using |
175 :: |
175 :: |
176 |
176 |
179 Then save the script using |
179 Then save the script using |
180 :: |
180 :: |
181 |
181 |
182 %save /home/fossee/show_included.py 1 3-6 8 10 13 |
182 %save /home/fossee/show_included.py 1 3-6 8 10 13 |
183 %run -i /home/fossee/show_included.py |
183 %run -i /home/fossee/show_included.py |
|
184 show() |
184 |
185 |
185 We get the desired plot. |
186 We get the desired plot. |
186 |
187 |
187 The reason for including a -i after run is to tell the interpreter that if any |
188 The reason for including a -i after run is to tell the interpreter that if any |
188 name is not found in script, search for it in the interpreter. Hence all these |
189 name is not found in script, search for it in the interpreter. Hence all these |
193 |
194 |
194 %% 4 %% Run the script without using the -i option. Do you find any difference? |
195 %% 4 %% Run the script without using the -i option. Do you find any difference? |
195 |
196 |
196 {{{ continue from paused state }}} |
197 {{{ continue from paused state }}} |
197 |
198 |
198 We see that it raises nameerror saying the name linspace is not found. |
199 We see that it raises NameError saying that the name linspace is not found. |
199 |
200 |
200 {{{ Show summary slide }}} |
201 {{{ Show summary slide }}} |
201 |
202 |
202 This brings us to the end of the tutorial. |
203 This brings us to the end of the tutorial. |
203 we have looked at |
204 we have looked at |
207 * saving the required lines of code in required order using %save |
208 * saving the required lines of code in required order using %save |
208 * using %run -i command to run the saved script |
209 * using %run -i command to run the saved script |
209 |
210 |
210 {{{ Show the "sponsored by FOSSEE" slide }}} |
211 {{{ Show the "sponsored by FOSSEE" slide }}} |
211 |
212 |
212 #[Nishanth]: Will add this line after all of us fix on one. |
213 |
213 This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India |
214 This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India |
214 |
215 |
215 Hope you have enjoyed and found it useful. |
216 Hope you have enjoyed and found it useful. |
216 Thank you! |
217 Thank you! |
217 |
218 |