[英]f-string with float formatting in list-comprehension
The [f'str']
for string formatting was recently introduced in python 3.6. 字符串格式化的
[f'str']
最近在python 3.6中引入。 link . 链接 。 I'm trying to compare the
.format()
and f'{expr}
methods. 我正在尝试比较
.format()
和f'{expr}
方法。
f ' <text> { <expression> <optional !s, !r, or !a> <optional : format specifier> } <text> ... '
Below is a list comprehension that converts Fahrenheit to Celsius. 以下是将华氏温度转换为摄氏温度的列表理解。
Using the .format()
method it prints the results as float to two decimal points and adds the string Celsius: 使用
.format()
方法,它将结果作为float打印到两个小数点,并添加字符串Celsius:
Fahrenheit = [32, 60, 102]
F_to_C = ['{:.2f} Celsius'.format((x - 32) * (5/9)) for x in Fahrenheit]
print(F_to_C)
# output ['0.00 Celsius', '15.56 Celsius', '38.89 Celsius']
I'm trying to replicate the above using the f'{expr}
method: 我正在尝试使用
f'{expr}
方法复制上面的内容:
print(f'{[((x - 32) * (5/9)) for x in Fahrenheit]}') # This prints the float numbers without formatting
# output: [0.0, 15.555555555555557, 38.88888888888889]
# need instead: ['0.00 Celsius', '15.56 Celsius', '38.89 Celsius']
Formatting the float in f'str'
can be achieved: 可以实现格式化
f'str'
的float:
n = 10
print(f'{n:.2f} Celsius') # prints 10.00 Celsius
Trying to implement that into the list comprehension: 试图将其实现到列表理解中:
print(f'{[((x - 32) * (5/9)) for x in Fahrenheit]:.2f}') # This will produce a TypeError: unsupported format string passed to list.__format__
Is it possible to achieve the same output as was done above using the .format()
method using f'str'
? 是否有可能使用
f'str'
使用.format()
方法实现与上面相同的输出?
Thank you. 谢谢。
You need to put the f-string inside the comprehension: 你需要将f-string放在理解中:
[f'{((x - 32) * (5/9)):.2f} Celsius' for x in Fahrenheit]
# ['0.00 Celsius', '15.56 Celsius', '38.89 Celsius']
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