python [Doku Wiki]

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===== Overview =====

First pass at Python course topics.

Links:

... coming ...

===== Internal links =====

  * [[Python_file_hierarchy]]

===== Packages =====

  * ''python3'' (Python 3.7)

<code>
$ python3 -V
Python 3.7.4
$
</code>

===== Online tutorial =====

==== 3 ====

  * string operations
  * string slices

==== 4 ====

  * "else" clause on loop constructs
  * range() function is an "iterable"
  * keyword arguments
  * lambda expressions
  * docstrings
  * function annotation(???)

==== 5 Data structures ====

  * lists
  * "import collections" (deque)
  * list comprehensions
  * set
  * dictionary
    * key can be any immutable type
    * "list(d)" returns list of keys
  * "enumerate()" routine for any sequence
  * "zip()" to iterate over two sequences simultaneously

===== TOPICS =====

  * string method join()
  * data types, numbers, literals
  * "_" as last value interactively
  * single and double quoted strings identical effectively
  * raw strings
  * "iterable" objects ("for" is an "iterator")
    * list(range(1,10))
    * tuple(range(1,10))
  * loops and trailing "else" construct

===== STUFF =====

  * ''%%>>> quit()%%''
  * PEP-8
  * function annotations

===== Basics =====

==== Arguments ====

<code>
import sys
print(sys.argv[0])
</code>

==== Printing ====

<code>
>>> print("hi")
>>> print("I am", age, "years old.")
>>> print(f"I am {age} years old.")     (format string)

>>> hilarious = False
>>> joke_evaluation = "Isn't that joke so funny?! {}"
>>> print(joke_evaluation.format(hilarious))
>>> print("Isn't that funny? {}".format(hilarious))

>>> print(end1 + end2 + end3 + end4 + end5 + end6, end=' ')
>>> print(end7 + end8 + end9 + end10 + end11 + end12)

>>> formatter = "{} {} {} {}"
>>> print(formatter.format(1, 2, 3, 4))
>>> print(formatter.format("one", "two", "three", "four"))
</code>

==== Strings ====

Raw strings: r"blah blah"

<code>
print("""\
Usage: thingy [OPTIONS]
     -h                        Display this usage message
     -H hostname               Hostname to connect to
""")
</code>