摘要：直接通过例子看比较好理解. ~~~python import pandas as pd data = [[1, 2, 3], [2, 2, 2], [7, 8, 9]] df = pd.DataFrame(data, index=['a', 'b', 'c'], columns=['i', 'j', 阅读全文

摘要：模式匹配 ~~~python import re match = re.match('Hello[ \t] (. )world','Hello Python world') match.group(1) out:'Python' ~~~ ~~~python match = re.match('/(. 阅读全文