Strings

Question 1

“Hello”

Answer 1

str

Question 2

‘hello’

Answer 2

str

Question 3

“ I don’t do that “

Answer 3

str

Question 4

String is

Answer 4

Ordered sequences

Question 5

Index and slicing str:

Answer 5

Used to grab sub sections of the string

Question 6

Indexing allows grabbing a:

Answer 6

A section of a string.

Question 7

Indexing notation uses:

Answer 7

[] Notation after the string (or variable assigned the string)

Question 8

Indexing =

Answer 8

[] and a number index indicating position of what to grab

Question 9

Character: h e l l o

Answer 9

Index: 0 1 2 3 4

Question 10

Reverse index:

Answer 10

Index: 0 -4 -3 -2 -1

Question 11

Slicing:

Answer 11

Allows grabbing a subset of multiple characters, a slice of string.

Question 12

Slicing syntax:

Answer 12

[start:stop:step]

Question 13

Slicing syntax: Start is:

Answer 13

Numerical index for the slice start

Question 14

Slicing syntax: Stop is:

Answer 14

Stop Index goes up to (but not include the last character)

Question 15

Slicing syntax: Step is:

Answer 15

Size of the “jump” you take.

Question 16

Does white space count as characters in strings:

Answer 16

Yes

Question 17

Strings are in what quotes:

Answer 17

“Words“ and ‘ word here’ or “You’re great”

Question 18

Print “Hello world”

Answer 18

print(“Hello world”)

Question 19

Add a line to a string

Answer 19

print(‘hello \n world’)

Question 20

Add a tab to a print

Answer 20

print(‘hello \t world’)

Question 21

Check length of string

Answer 21

len(’I am’) 4

Question 22

• mystring = ‘abcdefghijk’
• Reverse this str by 2

Answer 22

• mystring[::-2]
• ‘kigeca’

Question 23

• mystring = ‘abcdefghijk’
• grab only def

Answer 23

• mystring[:7]
• ‘abcdefg’

Question 24

• mystring = ‘abcdefghijk’
• grab ‘bc’

Answer 24

• mystring[1:3]
• ‘bc’

Question 25

• mystring = ‘abcdefghijk’
• mystring[2:9:3]

Answer 25

• ‘cfi’

Question 26

• mystring = ‘abcdefghijk’
• mystring[:7]

Answer 26

• ‘abcdefg’

Question 27

Access a range of characters in a string, you need to slice a string:

Answer 27

slicing operator :

Question 28

S [start : stop : step]

Answer 28

• Start position End position Increment

Question 29

• S = ‘ABCDEFGHI’
• print(S[2:7])

Answer 29

• # CDEFG

Question 30

• Slice with Positive & Negative Indices
• S = ‘ABCDEFGHI’
• print(S[2:-5])

Answer 30

• # CD

Question 31

• # Return every 2nd item between position 2 to 7
• S = ‘ABCDEFGHI’
• print(S[2:7:2])

Answer 31

• # CEG

Question 32

• # Returns every 2nd item between position 6 to 1 in reverse order
• S = ‘ABCDEFGHI’
• print(S[6:1:-2])

Answer 32

• # GEC

Question 33

• # Slice first three characters from the string
• S = ‘ABCDEFGHI’
• print(S[:3])

Answer 33

• # ABC

Question 34

• # Slice last three characters from the string
• S = ‘ABCDEFGHI’
• print(S[6:])

Answer 34

• # GHI

Question 35

• Str are:

Answer 35

• Immutable

Question 36

.format() method

Answer 36

• A good way to format objects into your strings for print statements is with the string .format() method.
• Syntax: ‘String here { } then also { }’.format(‘something1’,’something2’)

Question 37

• .format() example:
• Print the fox fox fox
• Print the quick brown fox
• Print “The quick brown fox’ using key words
• Print “The fox fox fox’ using key words

Answer 37

• print(‘The {0} {0} {0}’.format(‘fox’,’brown’,’quick’))
• print(‘The {2} {1} {0}’.format(‘fox’,’brown’,’quick’))
• print(‘the {q} {b} {f}’.format(f=’fox’,b=’brown’,q=’quick’))
• print(‘the {f} {f} {f}’.format(f=’fox’,b=’brown’,q=’quick’))

Question 38

Float formating Syntax: “{value:width.precisionf}”

Answer 38

• Pricision is most important. It tells how far past the decimal point to go.
• The last number is rounded up or down depending on the next number being high or low
• result = 0.1287001287001287
• print(“The result was {r:1.5f}”.format(r=result))
• The result was 0.12870

Question 39

• f string format method
• name = “Jose”

eg 2.

name = “Sam”

age = 3

Answer 39

• print(‘Hello, his name is {}’.format(name))
• f string method
• print(f’Hello, his name is {name}.’)

Hello, his name is Joe.

eg2

• print(f’{name} is {age} years old.’)

Same is 3 years old.

Question 40

Combine strings using

Answer 40

+ operator

>>> “pass” + “word”

‘password’

Question 41

multiply a string by a number using

Answer 41

* operator

>>> “Ha” * 4

‘HaHaHaHa’

Question 42

An “object” encapsulates two things: