HTML文件中的Python变量[重复]

python 3.6将添加 literal string interpolation 类似于ruby的字符串插值。从python的那个版本(计划在2016年底发布)开始,您将能够在“f-strings”中包含表达式,例如

name = "Spongebob Squarepants"
print(f"Who lives in a Pineapple under the sea? {name}.")

在3.6之前,最接近的是

name = "Spongebob Squarepants"
print("Who lives in a Pineapple under the sea? %(name)s." % locals())

这个 % 运算符可用于 string interpolation 在蟒蛇中。第一个操作数是要被插值的字符串,第二个操作数可以有不同的类型,包括一个“映射”,将字段名称映射到要被插值的值。这里我使用了局部变量字典 locals() 映射字段名 name 作为局部变量的值。

使用相同的代码 .format() 最新python版本的方法如下:

name = "Spongebob Squarepants"
print("Who lives in a Pineapple under the sea? {name!s}.".format(**locals()))

还有 string.Template 班级:

tmpl = string.Template("Who lives in a Pineapple under the sea? $name.")
print(tmpl.substitute(name="Spongebob Squarepants"))

由于Python2.6.x,您可能需要使用:

"my {0} string: {1}".format("cool", "Hello there!")

我已经开发了 interpy 包裹,那个 在python中启用字符串插值 .

只需通过 pip install interpy . 然后,添加行 # coding: interpy 在你文件的开头!

例子:

#!/usr/bin/env python
# coding: interpy

name = "Spongebob Squarepants"
print "Who lives in a Pineapple under the sea? \n#{name}."

python的字符串插值类似于c的printf()

如果你尝试:

name = "SpongeBob Squarepants"
print "Who lives in a Pineapple under the sea? %s" % name

标签 %s 将替换为 name 变量。您应该查看打印功能标签: http://docs.python.org/library/functions.html

字符串插值将是 included with Python 3.6 as specified in PEP 498 . 你将能够做到:

name = 'Spongebob Squarepants'
print(f'Who lives in a Pineapple under the sea? \n{name}')

注意我讨厌海绵宝宝,所以写这篇文章有点痛苦。:)

你也可以吃这个

name = "Spongebob Squarepants"
print "Who lives in a Pineapple under the sea? \n{name}.".format(name=name)

http://docs.python.org/2/library/string.html#formatstrings

import inspect
def s(template, **kwargs):
    "Usage: s(string, **locals())"
    if not kwargs:
        frame = inspect.currentframe()
        try:
            kwargs = frame.f_back.f_locals
        finally:
            del frame
        if not kwargs:
            kwargs = globals()
    return template.format(**kwargs)

用途:

a = 123
s('{a}', locals()) # print '123'
s('{a}') # it is equal to the above statement: print '123'
s('{b}') # raise an KeyError: b variable not found

注:性能可能有问题。这对于本地脚本非常有用,而不是生产日志。

复制:

• Python string formatting: % vs. .format

• What is the Python equivalent of embedding an expression in a string? (ie. "#{expr}" in Ruby)

• What is Ruby equivalent of Python's `s= "hello, %s. Where is %s?" % ("John","Mary")`

• Is there a Python equivalent to Ruby's string interpolation?

对于旧的python(在2.4上进行了测试),顶级解决方案指明了方向。你可以这样做:

import string

def try_interp():
    d = 1
    f = 1.1
    s = "s"
    print string.Template("d: $d f: $f s: $s").substitute(**locals())

try_interp()

你得到

d: 1 f: 1.1 s: s

Python3.6及更新版本具有 literal string interpolation 使用F字符串:

name='world'
print(f"Hello {name}!")