Automate the boring stuff with python

Link: Python

Ch.1 Python basics §

Variable names §

• no hyphens (e.g. new-balance)
• cannot begin with number

Concatenate §

• Use + operator can only add numbers or two strins
• Use str(), int(), float() to change data type

Ch.2 Flow control §

Flow control statement §

if, else and elif §

name = 'Carol'
age = 3000
if name == 'Alice':
    print('Hi, Alice.')
elif age < 12:
    print('You are not Alice, kiddo.')
else:
    print('You are neither Alice nor a little kid.')

while, break and continue §

• break: end the loop early
• continue: return to the start of the loop

  while True:
      print('Who are you?')
      name = input()
    ➊ if name != 'Joe':
        ➋ continue
       print('Hello, Joe. What is the password? (It is a fish.)')
    ➌ password = input()
       if password == 'swordfish':
        ➍ break
➎ print('Access granted.')

Truthy and falsey values §

When used in conditions, 0, 0.0 and ” (empty string) are considered False.

for and range() §

• break and continue can be used in for loops

  # Add 0 to 100
  ➊ total = 0
  ➋ for num in range(101):
      ➌ total = total + num
  ➍ print(total)

Note that it’s range(101) because range(start, end) does not include the end. Why? Because it’s actually mean “start and stop”. Think it as if it’s a stop sign!

sys.exit() function §

• sys.exit(): stop the program

Ch.3 Functions §