42 lines
722 B
Markdown
42 lines
722 B
Markdown
# 一些变量小技巧
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:::tip
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<https://docs.python.org/3/library/string.html>
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:::
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## 旧式字符串格式化（％ 运算符）
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```python
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print("hello %s, this is %d" %('world',45))
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```
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变量替换:
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```python
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```
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## 新式字符串格式化（str.format）
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```python
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print('{2}, {1}, {0}'.format('a', 'b', 'c'))
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print("hello {name}, this is {total}".format(name='world',total=45))
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```
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## 字符串插值 / f-Strings（Python 3.6+)
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```python
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name,total='world',45
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print(f"hello {name}, this is {total}" )
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```
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## 模板字符串（标准库）
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```python
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s = Template('$who likes $what')
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print(s.substitute(who='tim', what='kung pao'))
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d=dict(who='tim')
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Template('$who likes $what').safe_substitute(d)
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```
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