/
f_strings.py
150 lines (104 loc) · 2.09 KB
/
f_strings.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
a = 123
b = 'abc'
print('{} and {}'.format(a, b))
# 123 and abc
print('{first} and {second}'.format(first=a, second=b))
# 123 and abc
print(f'{a} and {b}')
# 123 and abc
print(F'{a} and {b}')
# 123 and abc
print(f"{a} and {b}")
# 123 and abc
print(f'''{a} and {b}''')
# 123 and abc
print(f"""{a} and {b}""")
# 123 and abc
s = 'abc'
print(f'right : {s:_>8}')
print(f'center: {s:_^8}')
print(f'left : {s:_<8}')
# right : _____abc
# center: __abc___
# left : abc_____
i = 1234
print(f'zero padding: {i:08}')
# zero padding: 00001234
print(f'comma: {i:,}')
# comma: 1,234
print(f'bin: {i:b}')
print(f'oct: {i:o}')
print(f'hex: {i:x}')
# bin: 10011010010
# oct: 2322
# hex: 4d2
print(f'bin: {i:#b}')
print(f'oct: {i:#o}')
print(f'hex: {i:#x}')
# bin: 0b10011010010
# oct: 0o2322
# hex: 0x4d2
f = 12.3456
print(f'digit(decimal): {f:.3f}')
print(f'digit(all) : {f:.3g}')
# digit(decimal): 12.346
# digit(all) : 12.3
print(f'exponen: {f:.3e}')
# exponen: 1.235e+01
f = 0.123
print(f'percent: {f:.2%}')
# percent: 12.30%
n = 123
print(f'{{}}-{n}-{{{n}}}')
# {}-123-{123}
n = 123
i = 8
print('{n:0{i}}'.format(n=n, i=i))
# 00000123
print(f'{n:0{i}}')
# 00000123
f = 1.2345
for i in range(5):
print(f'{f:.{i}f}')
# 1
# 1.2
# 1.23
# 1.234
# 1.2345
print('x\ty')
# x y
print(r'x\ty')
# x\ty
x = 'XXX'
y = 'YYY'
print(f'{x}\t{y}')
# XXX YYY
print(rf'{x}\t{y}')
# XXX\tYYY
print(fr'{x}\t{y}')
# XXX\tYYY
a = 3
b = 4
# print('{a} + {b} = {a + b}'.format(a=a, b=b))
# KeyError: 'a + b'
print(f'{a} + {b} = {a + b}')
# 3 + 4 = 7
print(f'{a} * {b} = {a * b}')
# 3 * 4 = 12
print(f'{a} / {b} = {a / b:.2e}')
# 3 / 4 = 7.50e-01
d = {'key1': 3, 'key2': 4}
print('{0[key1]}, {0[key2]}'.format(d))
# 3, 4
# print('{0["key1"]}, {0["key2"]}'.format(d))
# KeyError: '"key1"'
print(f'{d["key1"]}, {d["key2"]}')
# 3, 4
# print(f'{d[key1]}, {d[key2]}')
# NameError: name 'key1' is not defined
# print(f'{d['key1']}, {d['key2']}')
# SyntaxError: invalid syntax
print(f"{d['key1']}, {d['key2']}")
# 3, 4
# print(f'{d[\'key1\']}, {d[\'key2\']}')
# SyntaxError: f-string expression part cannot include a backslash