Lesson 1 - Hello World with Python and Jupyter

You can execute the line of code below by clicking in the cell below and pressing Shift+Enter.



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print ("hello World")

Next, copy or type the same line of code into a text file and save the file as hello.py.

You could execute the code in the file using the python command at the system prompt, like this C:\>python textfiles\hello.py.

In a Jupyter notebook, an exclamation point is used to send the command to the operating system. Press Shift+Enter in the cell below to run the code in the hello.py file.



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!python textfiles\hello.py  # ! accesses the operating system without leaving the notebook



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%quickref   # brings up some info about jupyter magics

Play around with what you have learned . . .



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import math   # now I'm just playing around, not following Socratica

Pythagorean Theorem: $c = \sqrt{a^2 + b^2}$



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def pythag(a,b):
    return math.sqrt(a**2 + b**2)       # defined a python function



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pythag(3,4)                             # used my function



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math.sin(math.pi / 2)                   # playing with math.sin and math.pi



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5 / 2



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5 // 2



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