Class Review Flashcards
True or False: Python is a proprietary, expensive, difficult-to-learn language owned by Microsoft?
False
What is a literal?
A hard-coded instruction - literally this string, this number, etc.
What is the character for single-line comments?
#
What is the escape sequence for a single quote within a string?
'
‘I don't want eggs for breakfast.’
What is the character limit for a single line according to the Python Style Guide?
79 characters
What are the three keywords for conditional “IF” flow control structures?
if, elif, else
Does python use braces for controlling application flow?
No - it uses tabs - spacing!
Does python use static or dynamic data typing for variables? (Hint: duck typing)
Dynamic typing - duck typing - if it walks like a duck and acts like a duck… it’s a duck!
What do we call objects that can return their members one at a time?
Iterables
What are Python lists similar to in other languages?
Arrays
Which types of sequences are immutable?
Tuples, strings
What are generator expressions?
Iterables that can only be iterated through once
When files are read into python, what does python store them in?
File objects
What are the different options to sort on with the sorted function?
Existing functions, lambda functions, reversed
Does python provide keywords for handling exceptions?
Yes! Try, except, else, finally.
Can you create custom functions in python?
Yes!
def [function name](parameter):
# passWhat are the different ways for one module to use another?
from [module] import [function]
from [module] import *
import [module]
What is the .pyc extension file?
compiled python files
Where does python search for modules?
Current directory, standard library, and sys.path
What are some of the string methods commonly used in our class?
string. join(sequence) - shortcut for a for loop for joining strings
string. split(‘delimiter’) - split by character within parens - default space
string. lower() - lowercase
string. strip(‘character’) - strip characters from both sides of string - default all whitespace
How do you format strings in python? (new way)
f’string {variable} {expression}
‘string {index 0} {index 1}’.format(variable, expression)
How do you read arguments from the command line?
import sys
sys. argv is a list of arguments
sys. argv[0] = file name
all other arguments separated by space on command line.
What are two ways to short-circuit a loop?
continue - go to the top of the loop
break - exit out of the loop and move on to the next code (if any)
How do you slice an array? Bonus: how do you slice an array backwards?
[start:stop:step] default start: 0; default stop: end of array; default step: 1
index 0 through 10:
[:11]
index 2 through 14 by 2s:
[2:15:2]
backwards by 5s:
[30:0:-5]
