OPS445 Reference Sheet For Assessments

• Note: words in (these) indicate a thing you will have to write, the parentheses are not part of the syntax.
• Note: variable placeholders will use x, y, and so on.

First Quiz

Shebang

#!/usr/bin/env python3

Built-in Functions

• help()
• type()
• print()
• input()
• int()
• str()
• float()
• len()
• round()

Conditions

if (condition):
    (action1)
elif (condition2):
    (action2)
else:
    (action)

Loops

while (condition1):
    (action)
    if (condition2):
        break

for x in y:
    (action)

for i in range(x, y):
    (action)

Command Line Arguments

import sys

sys.argv

Import Keywords

• from (module) import (something)
• import (module) as (alias)

Comparison Operators

Col 1	Col 2
<	>
<=	>=
==	!=

Logical Operators

• and
• or
• not

Math Operators

Col 1	Col 2
+	-
*	**
/	//
+=	-=
*=	/=
%

Boolean Keywords

• True
• False
• None

---

Second Quiz

Functions

def func_name(x='Default value'):
    return y

Main Block

if __name__ == "__main__":

Shell Commands

os.system('x')
os.popen('x').read()
p = subprocess.Popen(['x'], stdout=subprocess.PIPE, stdin=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
s = p.communicate()
s[0].decode('utf-8')

Lists

x = []
x.append(x)
x.insert(x, y)
x.remove(x)
x.sort()
x.pop()

y in x

Tuples

x = (y, )
x = (y, z)

Sets

x = {x, y}
x.add(x)

Combinations

Method 1	Method 2
x & y	x.intersection(y)
x - y	x.difference(y)
x ^ y	x.symmetric_difference(y)
x | y	x.union(y)

Dictionaries

x = {y: z, a: b}
x[y] = z

x.keys()
x.values()
x.items()

Slicing

x = 'PYTHON'
x[:z]
x[y:]
x[y:z]

Strings

• upper()
• lower()
• capitalize()
• swapcase()
• title()
• strip()
• split()
• join()
• center()
• replace()
• startswith()

---

Third Quiz

File Operations

f = open(filename, operation_flag)

File Object Methods

• read
• write
• readline
• readlines
• close

Exception Handling

try:
    ...
except (error1, error2):
    ...
except error3:
    ...
except:
    ...

Common Exceptions

• NameError
• SyntaxError
• IndexError
• ValueError
• FileNotFoundError
• KeyError

---

Fourth Quiz

F-Strings

print(f'Hello World')
x = 'John'
print(f'Hello {x}')

y = 3
print(f'Formatted: {y:02d} minutes.')  # 03
print(f'Formatted: {y:.2f} dollars.')  # 3.00

Classes

class Name:

    def __init__(self, x, y):
        self.x = x
        self.y = y

    def method(self):
        ...


n1 = Name(x, y)

Magic Methods

class Name:

    def __eq__(self, other):
        return self == other

Equality Operators

• __eq__
• __ne__
• __gt__
• __lt__
• __ge__
• __le__

Math Operators

• __add__
• __sub__
• __mul__
• __truediv__
• __mod__
• __floordiv__
• __pow__

Other Dunders

• __len__
• __str__
• __repr__

Fifth Quiz

Ansible Ad-Hoc

ansible remote_machine_id [-i inventory] [--private-key id_rsa] [-u remote_user] -a 'date'

Playbooks

- hosts: 
  user: 
  become: 
  vars:
  tasks:
    - name: 
      yum: name= state=
    
    - name: 
      service: 
        name: 
        state: 

    - name:  
      copy:
        dest: 
        src:
        owner:
        group:
        mode:

    - name:
      user:
        name:
        comment:
        group:
        append: