July 2017
Intermediate to advanced
398 pages
11h 54m
Chinese
Content preview from Python数据处理
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88
｜
第
5
章
➌
如果该行不在
double_lined_countries
列表中，那么将该行内容添加到国家列表中。这
里我们用的是
elif
，在
Python
中的意思是
else if
。如果你想使用一种不同于
if -
else
的逻辑流，这是一个很好用的工具。
重新运行脚本，我们发现
'Bolivia (Plurinational State of)'
已经合在一起了。现在我
们需要检查结果中是否包含了所有国家。由于数据集比较小，我们可以手动检查，但如果
数据集较大的话，你需要将检查过程自动化。
数据检查自动化
何时手动检查数据，何时用
Python
自动化完成，怎么选择？下面给出几点建议。
•
如果要定期反复解析数据，选择自动化。
•
如果你的数据集比较大，你很可能应该选择自动化。
•
如果你的数据集可控，而且你只需要解析一次，那么你选哪种方式都可以。在我们
的例子中，数据集很小，所以我们没有选择自动化。
用
PDF
阅读器查看
PDF
文件，找出所有占两行的国家名称：
Bolivia (Plurinational State of)
Democratic People's Republic of Korea
Democratic Republic of the Congo
Lao People's Democratic Republic
Micronesia (Federated States of)
Saint Vincent and the Grenadines
The former Yugoslav Republic ...
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