t-strings

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CPython 3.14b1以降をインストール

code:shell

$ uv python install 3.14.0b3

$ uv python pin 3.14.0b3

t-stringの動作確認

簡単な例

code:python

Type "help", "copyright", "credits" or "license" for more information.

>> name = "PyCon"

>> tmpl = t"hello {name}!"

>> tmpl

Template(strings=('hello ', '!'), interpolations=(Interpolation('PyCon', 'name', None, ''),))

>> for s in tmpl:

... if isinstance(s, str):

... print(s, end="")

... else:

... print(s.value, end="")

...

hello PYCON!

lower/upper

code:hello.py

# /// script

# requires-python = ">=3.14"

# ///

from dataclasses import dataclass

@dataclass

class Profile:

name: str

age: int

def __str__(self):

return f"{self.name} is {self.age:03d} years old"

@property

def tmpl(self):

return t"{self.name} is {self.age:03d} years old"

def tprint(template):

for s in template:

if isinstance(s, str):

print(s.lower(), end="")

else:

print(str(s.value).upper(), end="")

print()

def main():

profile = Profile(name="Shimizukawa", age=30)

print(profile)

tmpl = profile.tmpl

print(tmpl)

tprint(tmpl)

if __name__ == "__main__":

main()

実行

code:shell

% uv run hello.py

Shimizukawa is 030 years old

Template(strings=('', ' is ', ' years old'), interpolations=(Interpolation('Shimizukawa', 'self.name', None, ''), Interpolation(30, 'self.age', None, '03d')))

SHIMIZUKAWA is 30 years old

tdomの動作

tdomのサンプル

code:tdom-exsample.py

# /// script

# requires-python = ">=3.14"

# dependencies = [

# "tdom",

# ]

# ///

from tdom import html

def render_fstring(value):

s = f"<div>Hello {value}!</div>"

print(s)

def render_tstring(value):

tmpl = t"<div>Hello {value}!</div>"

print(html(tmpl))

render_fstring("PyCon")

render_tstring("PyCon")

render_fstring("</div><script>alert('XSS')</script>")

render_tstring("</div><script>alert('XSS')</script>")

実行

code:shell

$ uv run python tdom-example.py

<div>Hello PyCon!</div>

<div>Hello PyCon!</div>

<div>Hello </div><script>alert('XSS')</script>!</div>

<div>Hello &lt;/div&gt;&lt;script&gt;alert(&#x27;XSS&#x27;)&lt;/script&gt;!</div>

sql-tstringの動作

サンプル

code:sql-example.py

# /// script

# requires-python = ">=3.14"

# dependencies = [

# "sql-tstring",

# ]

# ///

from sql_tstring import sql

def render_fstring(value):

s = f"SELECT a, b, c FROM tbl WHERE a = {value}"

print(s)

def render_tstring(value):

tmpl = t"SELECT a, b, c FROM tbl WHERE a = {value}"

print(sql(tmpl))

breakpoint()

render_fstring("bp")

render_tstring("bp")

render_fstring("0; DROP TABLE tbl; --")

render_tstring("0; DROP TABLE tbl; --")

実行

code:shell

$ uv run python sql-example.py

SELECT a, b, c FROM tbl WHERE a = bp

SELECT a, b, c FROM tbl WHERE a = 0; DROP TABLE tbl; --