AtBS 1-6

Question 1

An interactive shell is

Answer 1

a program that lets you type instructions into the computer and run one at a time

Question 2

A file editor is..

Answer 2

Similar to a text editor, can write whole program in it to be run

Question 3

How to print something to the shell?

Answer 3

print(‘Message’)

Question 4

How to find length of a string?

Answer 4

print(len(myString))

Question 5

How to write an if statement in Python?

Answer 5

if variable ==’input’:

do something

Question 6

How to add else statement to if statement?

Answer 6

if variable ==’input’: do something

else: do something else

Question 7

What does elif mean?

Answer 7

Else If

Question 8

How to comment in Python

Answer 8

Use the pound sign #

Question 9

Key command to interrupt Python?

Answer 9

Ctrl+C

Question 10

What does a continue statement do?

Answer 10

Jumps back to the start of the loop to reevaluate the loops condition

Question 11

What does a break statement do?

Answer 11

It gets out of loop if execution leads to it.

Question 12

How to input a number as an integer?

Answer 12

Variable=int(input())

Question 13

Formula for Gauss Loop

Answer 13

total=0

for num in range(101):

total=total+num

print(total)

Question 14

What is the standard library?

Answer 14

It is the set of modules that Python comes with; Each module has a related group of functions that can be used in programs ex. random and math module

Question 15

An argument is..

Answer 15

The value that a function evaluates ex print(‘argument’) len(argument)

Question 16

What are the three boolean operators?

Answer 16

and

or

not

Question 17

What are the six comparison operators?

Answer 17

>

<

<=

>=

==

!=

Question 18

How to handle exceptions?

Answer 18

Use Try and Except

Question 19

What is a return value?

Answer 19

It is the value that a function evaluates to

Question 20

If you had a function name bacon() in a module name spam, how would you call it after importing spam?

Answer 20

Can be called with spam.bacon

Question 21

Syntax to create a list

Answer 21

spam=[‘cat’,’bat’,’rat’,’elephant’]

Question 22

Syntax to add to a list

Answer 22

spam=spam+[‘pteradactyl’]

Question 23

Delete rat from following list [‘cat’, ‘mouse’, ‘rat’, ‘elephant’, ‘pteradactyl’]

Answer 23

del spam[2]

Question 24

What do the in and not in operators do?

Answer 24

They can check whether a value is in a list or not.

They evaluate to True or False

Question 25

What is an augmented assignment operator?

Answer 25

Instead of spam=spam+1 do spam+=1 This is shorter

Question 26

How to find the position of a value in a list?

Answer 26

Use index method to find it spam.index(value)

Question 27

How to add a value to a list?

Answer 27

use append method to add to a list spam.append('value')

Question 28

How to insert a value to a list?

Answer 28

use insert method to add to a list spam.insert(position num,value) This does not replace the value

Question 29

How to replace a value in a list?

Answer 29

spam[num in list] = new value

Question 30

How to remove a value in a list?

Answer 30

Use remove method spam.remove(value)

Question 31

How to sort values in a list?

Answer 31

Use sort method spam.sort()

Question 32

How to reverse sort in a list?

Answer 32

spam.sort(reverse=True)

Question 33

What is a tuple?

Answer 33

Like list but they are immutable and typed in parentheses ()

Question 34

When you assign a list to a variable, what are you actually assigning?

Answer 34

You are actually assigning a reference and not the values themselves

Question 35

How to make separate copies of lists and not just references?

Answer 35

import copy module use copy.copy() function for lists for list within list use deepcopy() function

Question 36

How to create a dictionary? Dictionary Format

Answer 36

Use curly brackets myCat={'size':'fat'} Dictionary Name = {'Key':'Value'}

Question 37

How are dictionaries different than lists?

Answer 37

Dictionaries are unordered Lists are ordered

Question 38

What are the advantages of dictionaries?

Answer 38

Dictionaries give the ability to have arbitrary keys. ie name, age etc

Question 39

How to print all values in a dictionary?

Answer 39

for v in spam.values(): print(v)

Question 40

How to print all keys in a dictionary?

Answer 40

for v in spam.keys(): print(v)

Question 41

What is the combination of both a dictionary key and value called? 'key':'value'

Answer 41

It is called an item

Question 42

What does the get() Method do? Syntax

Answer 42

It uses a key of a value to retrieve and a fallback option if that key is not found in a dictionary ex spam.get('key','fallback')returns either the value of the key inputted or 'fallback'

Question 43

What does the setdefault() method do? Syntax

Answer 43

It places a key and a value in a dictionary if not already there spam .setdefault ('key', 'value')

Question 44

What does pprint function do to dictionaries? Syntax

Answer 44

Prints the dictionary vertically pprint.pprint(DictName)

Question 45

How to change a value in a dictionary? Syntax

Answer 45

Dict\_Name['key'] = 'value'

Question 46

How to get pprint to only go to one line for each item to print in a dictionary?

Answer 46

pprint(DictName, width=1)

Question 47

What can having double quotes do for a string? Example

Answer 47

They allow you to have a single quote character in the string. Example "This is Alice's cat."

Question 48

What is an escape character and what does it let you do?

Answer 48

It is character that lets you use other characters that you normally cannot use In Python it is the backslash \

Question 49

Escape character to use Single quote? Double quote?

Answer 49

\' \"

Question 50

Escape character to Tab Linebreak Backslash

Answer 50

\t \n \\

Question 51

What is a raw string? Syntax When is it useful?

Answer 51

A raw string completly ignores all escape characters and will print the entirety between quotes as a string. print(r'That is Carol\'s cat.') It is useful for regular expressions.

Question 52

What is a multiline string?

Answer 52

A multiline string starts off with 3 single or double quotes It lets you type multiple lines as a string It ends with 3 single or double quotes

Question 53

How to write multiline comments in python?

Answer 53

""" use the multiline string of 3 quotes before comments and 3 quotes after """

Question 54

How does slicing a string work? spam='Hello World' spam[0] returns spam[0:2] returns

Answer 54

If you specify one index position Python returns that position in a string If you specify a range Python includes beginning index but not the ending index spam[0] returns 'H' spam[0:2] returns 'He'

Question 55

spam='Hello World!' slice the string to say 'Hello' slice the string to say 'World!'

Answer 55

spam[:5] 'Hello' spam[6:] 'World!'

Question 56

spam='Hello World!' What would the methods spam = spam.upper() spam = spam.lower()

Answer 56

upper() ='HELLO WORLD!' lower()= 'hello world!'

Question 57

What does isupper() and islower()

Answer 57

Return True if all letters are upper or lower False if no letters or a mix of upper and lower

Question 58

What do the following methods do? isalpha() isalnum() isdecimal()

Answer 58

isalpha() True if all letters isalnum() True if only numbers and letters isdecimal() True if only numbers

Question 59

What do the following methods do? isspace() istitle()

Answer 59

isspace() True if string only spaces, tabs and newlines istitle() True if string only has uppercase letter folowed by undercase

Question 60

What do the startswith() and endswith() methods return?

Answer 60

The return either true or false if a string begins or ends with the value ex spam=('The world') spam.startswith('The') returns True

Question 61

What does the join property do? Syntax?

Answer 61

Join a series of strings into one string ' '.join(['My','name', 'is', 'Simon']) 'My name is Simon' or ' @'.join(['My','name', 'is', 'Simon']) 'My @name @is @Simon'

Question 62

What does the split method do?

Answer 62

It splits one string into multiple strings, usually based on whitespace but you can set it for other items as well 'My name is Simon'.split('m') ['My na', 'e is Si', 'on']

Question 63

What kind of brakets for: list dictionary tuple

Answer 63

list [] dictonary{} tuple()

Question 64

What do the rjust() and ljust() methods do? Syntax?

Answer 64

They return a padded version of the string that they are on. 'Hello'.rjust(10) returns ' Hello'

Question 65

What does 'Hello'.rjust(20,'\*') return?

Answer 65

'\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*Hello'

Question 66

What does 'Hello'.center(20,'$') return

Answer 66

'$$$$$$$Hello$$$$$$$$'

Question 67

What do the strip(), rstrip() and lstrip methods do?

Answer 67

Remove whitespace from string. L and R remove it from left and right sides OR it can specify certain charcters to be stripped from the ends

Question 68

spam='Blue Bell Ice Cream' What will spam.strip('amBl') return?

Answer 68

'ue Bell Ice Cre'

Question 69

How to install third party modules?

Answer 69

Open command line pip install ModuleName

Question 70

How to copy text from clipboard so python can use it?

Answer 70

New Variable=pyperclip.paste()