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Contents
  1. 1. python
    1. 1.1. What can you do with python?
    2. 1.2. Environment Setup
    3. 1.3. Python basic data types
    4. 1.4. Making choices: boolean, if/eif/else, compound conditionals
    5. 1.5. Lists
    6. 1.6. Loops
  2. 2. Great Bash

python

What can you do with python?

  • Versatile language, can use it across a lot of different domains
  • really fast to learn and fast to develop in

    Environment Setup

    link

    Python basic data types

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    >>> type(1)
    <type 'int'>
    >>> type(1.0)
    <type 'float'>
    Type is a functions that takes input and spits out output.

a function is just the name and then input inside parentheses, and it’ll spit out output.

If you need to include the string delimiter inside the string just precede it with a backslash, as in ‘It's a wrap’

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>>> "Hello " + str(1)
'Hello 1'

Making choices: boolean, if/eif/else, compound conditionals

Boolean:

  • True
  • False
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    >>> x = 1
    >>> x > 0 and x < 2
    True
    >>> "a" in "hello" or "e" in "hello"
    True

    >>> temp = 32
    >>> if temp > 60 and temp < 75:
    ...     print("Nice and cozy")
    ... else:
    ...     print("Too extreme for me")
    ...
    Too extreme for me

    >>> sister = 15
    >>> brother =15
    >>> if sister > brother:
    ...     print("Sister is older")
    ... elif sister == brother:
    ...     print("Same age!")
    ... else:
    ...     print("Brother is older")
    ...
    Same age!

    Lists

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    >>> names = ["Alice", "Amy"]
    >>> names.append("Adam")
    >>> names
    ['Alice', 'Amy', 'Adam']
    >>> names[len(names)-1]
    'Adam'
    >>> names[-1]
    'Adam'
    The real superpower when using lists is actually to be able to loop over them.

Loops

Great Bash

  • Redirect the output of commands
    • Standard error is file descriptor “2” ls -l myscript not.here > lsout 2> lserr
    • Out and error can be redirected separately or together ls -l myscript not.here &> lsboth
    • The order of redirection is important
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      ls -l myscript not.here > lsout 2>&1
      ## Redirectin error output to standard output
      ## Standard output is already being re-directed to file > dirlist
      ## Hence, both error and standard output are written to file lsout
  • Redirecting and piping input and output
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    ls > /tmp/lsout
    wc < /tmp/lsout
    Use the vertical bar character | to create a pipe: ls|wc

Connect a series of commands with | symbols to make a pipeline.

  • Create input with here documents
Contents
  1. 1. python
    1. 1.1. What can you do with python?
    2. 1.2. Environment Setup
    3. 1.3. Python basic data types
    4. 1.4. Making choices: boolean, if/eif/else, compound conditionals
    5. 1.5. Lists
    6. 1.6. Loops
  2. 2. Great Bash