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Review: python_essentials.md #139

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4 changes: 2 additions & 2 deletions lectures/python_essentials.md
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Expand Up @@ -477,7 +477,7 @@ dallas: 1223229
data_file = open('us_cities.txt', 'r')
for line in data_file:
city, population = line.split(':') # 元组解包
city = city.title() # 城市名称首字母大写
city = city.title() # 将城市名称中每个单词的首字母大写
population = f'{int(population):,}' # 为数字添加逗号
print(city.ljust(15) + population)
data_file.close()
Expand Down Expand Up @@ -721,7 +721,7 @@ any([1 <= 2 <= 3, "a" in "letter"])
```{index} single: Python; Docstrings
```

Python 有一个为模块、类、函数等添加注释的系统，称为*文档字符串*。
Python 提供了一种为模块、类、函数等编写说明文档的机制，称为*文档字符串*。

文档字符串的优点在于它们在运行时可用。

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