Dictionary

# TTY

Comes from electromechanical teleprinters or teletypewriters.

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# Memory cell

An electronic circuit.

Stores one bit of binary information.

Stores a logic 1 (high voltage level) and reset to store a logic 0 (low voltage level).

Each byte is 8 bit, and each memory cell has an address.

# f-strings

String literals that have embedded expressions.

      
        name = "Fred"
        f"He said his name is {name}."

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# Arithmetic progressions

A sequence of numbers in which the difference between consecutive terms is constant.

General formula: a, a+d, a+2d, a+3d, ...
a is the first term.
Fixed difference is called the common difference (represented as d).

Positive common difference example sequence: 3, 7, 11, 15, 19, ...

Negative common difference example sequence: 20, 15, 10, 5, 0, ...

# docstring

Short for documentation string.

A special string used to document a module, class, or function in Python.

Stored as part of the function’s metadata.

# Call by reference

The value is always an object reference, not the value of the object.

      
      robot = {}
      def deactivate(p):
          p['active'] = False
      print("Robot before function call: ", robot)
      deactivate(robot)
      print("Robot after function call: ", robot)

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# Call by value

The actual parameters are evaluated and their values are copied to the callee.

      
      color = 'purple'
      def some_func(p):
          p = 'turquoise'
      print("Before: ", color)
      some_func(color)
      print("After: ", color)

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