Python String Formatting

Front 1

What is the basic way that positional formatting is done in Python?
'___'.format(a)

Back 1

'{}'.format(a)

Front 2

a='x'
b='y'

____________

-> 'x and y'

Back 2

print('{} and {}'.format(a,b))

Front 3

a='first'

b='second'

print(____________.format(b, a))
-> 'first and second'

Back 3

print('{1} and {0}'.format(b,a))

Front 4

What flags are used to indicate the str() and repr() representations?

Back 4

str = '{0!s}'

repr = {0!r}

Front 5

What flag is used to use the ascii value of the repr() method?

Back 5

a = '{0!a}'

Front 6

How do you left-pad a string to a minimum of 10 spaces?

Back 6

'{:>10}'.format('test')

Front 7

How do you right-pad a string to a minimum of 10 spaces?

Back 7

'{:10}'.format('test')

Front 8

How do you centre-align a string in a 10 total character string?

Back 8

'{:^10}'.format('test)

Front 9

How do you pad with other characters (ex: '_')?

Back 9

'{:_>10}'.format('test')

Front 10

How do you truncate a long string? (ex. to 5 characters)

Back 10

'{:.5}'.format('alongstring')

Front 11

How do you truncate a string to 5 characters and right pad it to 10 characters?

Back 11

'{:10.5}'.format('alongstring')

Front 12

What are the flags for integers and floats?

Back 12

'{:d}' and '{:f}'

Front 13

How do you pad a number to width 4?

Back 13

'{:4d}'.format(42)

Front 14

How do you pad a float so it has 2 decimal places, total width 6, and pads with 0s?

Back 14

'{:06.2f}'.format('3.14159')

Front 15

How do you always show a +/- sign in front of a number?

Back 15

'{:+d}'.format(42)

Front 16

How do you insert a space to positive numbers to retain consistent spacing with negative signs?

Back 16

'{: d}'.format(42)

Front 17

How do you control the total number of spaces allotted for the '-' and the number?

Back 17

'{:=5d}'.format((- 23))

Front 18

data = {'first': 'Hodor', 'last': 'Hodor!'}

_______.format(____)

-> Hodor Hodor!

Back 18

'{first} {last}'.format(data**)

Front 19

data = [4, 8, 15, 16, 23, 42]

_____.format(____)

-> 8 4

Back 19

'{d[2]} {d[4]}'.format(d=data)

Front 20

class Plant(object):

type = 'tree'

_____.format(___)

->tree

Back 20

'{p.type}'.format(p=Plant())

Front 21

from datetime import datetime

d = datetime(2001, 2, 3, 4, 5)

_______.format(d)

-> 2001-02-03 04:05

Back 21

'{%Y}-{%m}-{%d} {%H}:{%M}'.format(d)

Front 22

Given prec = 3, str = "Gibberish", and n =2.7182,

use parameterized precision to output:

-> Gib = 2.718

Back 22

'{:.{prec}} = {:.{prec}f}'.format(str, n, prec)

Front 23

How do you define custom formats for objects passed to the format() method?

Back 23

modify the __format__ function