我正在使用pandas findall函数提取一些模式.但是,我有几个正则表达式.这样,我怎么能找到所有带有N个大熊猫的正则表达式？
例如,假设我要提取特定列中的所有数字和所有日期：
在：
dfs = pd.DataFrame(data={'c1': ['This dataset 11/12/98 contains 5,000 rows, which were sampled from a 500,000 11/12/12 row dataset spanning the same time period. Throughout these analyses',
'the number of events you count will be about 100 times smaller than they 11/12/78 actually were, but the 01/12/11 proportions of events will still generally be reflective that larger dataset. In this case, a sample is fine because our purpose is to learn methods of data analysis with Python, not to create 100% accurate recommendations to Watsi.']})
dfs
出：
c1
0 This dataset 11/12/98 contains 5,000 rows, whi...
1 the number of events you count will be about 1...
我试图这样做,但是出现以下错误：
在：
dfs['patterns'] = dfs['c1'].str.findall([r'\d+',r'(\d+/\d+/\d+)']).apply(', '.join)
dfs
出：
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-64-af2969e06a61> in <module>()
----> 1 dfs['patterns'] = dfs['c1'].str.findall([r'\d+',r'(\d+/\d+/\d+)']).apply(', '.join)
2 dfs
/usr/local/lib/python3.5/site-packages/pandas/core/strings.py in wrapper2(self, pat, flags, **kwargs)
1268
1269 def wrapper2(self, pat, flags=0, **kwargs):
-> 1270 result = f(self._data, pat, flags=flags, **kwargs)
1271 return self._wrap_result(result)
1272
/usr/local/lib/python3.5/site-packages/pandas/core/strings.py in str_findall(arr, pat, flags)
827 extractall : returns DataFrame with one column per capture group
828 """
--> 829 regex = re.compile(pat, flags=flags)
830 return _na_map(regex.findall, arr)
831
/usr/local/Cellar/python3/3.5.2_2/Frameworks/Python.framework/Versions/3.5/lib/python3.5/re.py in compile(pattern, flags)
222 def compile(pattern, flags=0):
223 "Compile a regular expression pattern, returning a pattern object."
--> 224 return _compile(pattern, flags)
225
226 def purge():
/usr/local/Cellar/python3/3.5.2_2/Frameworks/Python.framework/Versions/3.5/lib/python3.5/re.py in _compile(pattern, flags)
279 # internal: compile pattern
280 try:
--> 281 p, loc = _cache[type(pattern), pattern, flags]
282 if loc is None or loc == _locale.setlocale(_locale.LC_CTYPE):
283 return p
TypeError: unhashable type: 'list'
因此,如何使用findall函数“堆叠”,“嵌套”或应用多个正则表达式？我期望作为输出的是在单列中由分隔的每个正则表达式的分辨率：
col
0 '11/12/98', '5', '000', '500', '000', '11/12/12'
1 '100', '11/12/78', '01/12/11', '100'
更新
我试过了：
dfs['patterns'] = dfs['c1'].str.map(findall(),[r'\d+',r'(\d+/\d+/\d+)']).apply(', '.join)
dfs
解决方法:
仍无法清除所需的输出.
但是请检查以下代码.
dfs['patterns'] = dfs['c1'].str.findall(r'\d+\/\d+\/\d+|\d+')
print dfs['patterns'].sum()
['11/12/98', '5', '000', '500', '000', '11/12/12', '100', '11/12/78', '01/12/11', '100']
标签：pandas,python-3-x,python 来源： https://codeday.me/bug/20191111/2021739.html
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