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It is also known as REPL (Read, Evaluate, Print, Loop), where it reads the command, evaluates the command, prints the result, and loop it back to read the command again. To run the Python Shell, open the command prompt or power shell on Windows and terminal window on mac, write python and press enter.
Answer #3: Alt + p for previous command from histroy, Alt + n for next command from history. This is default configure, and you can change these key shortcut at your preference from Options -> Configure IDLE.
The Python interactive console (also called the Python interpreter or Python shell) provides programmers with a quick way to execute commands and try out or test code without creating a file.
Underscore.
>>> 5+5
10
>>> _
10
>>> _ + 5
15
>>> _
15
Just for the record, ipython takes this one step further and you can access every result with _ and its numeric value
In [1]: 10
Out[1]: 10
In [2]: 32
Out[2]: 32
In [3]: _
Out[3]: 32
In [4]: _1
Out[4]: 10
In [5]: _2
Out[5]: 32
In [6]: _1 + _2
Out[6]: 42
In [7]: _6
Out[7]: 42
And it is possible to edit ranges of lines with the %ed macro too:
In [1]: def foo():
...: print "bar"
...:
...:
In [2]: foo()
bar
In [3]: %ed 1-2
IPython allows you to go beyond the single underscore _ with double (__) and triple underscore (___), returning results of the second- and third-to-last commands.
Alternatively, you can also use Out[n], where n is the number of the input that generated the output:
In [64]: 1+1
Out[64]: 2
...
In [155]: Out[64] + 3
Out[155]: 5
For more info, see https://jakevdp.github.io/PythonDataScienceHandbook/01.04-input-output-history.html .
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