(self, key, value) 1284 ) 1285 1286 check_dict_or_set_indexers(key) 1287 key = com.apply_if_callable(key, self) -> 1288 cacher_needs_updating = self._check_is_chained_assignment_possible() 1289 1290 if key is Ellipsis: 1291 key = slice(None) ~/work/pandas/pandas/pandas/core/seri...
"two"]] In [9]: pd.MultiIndex.from_product(iterables, names=["first", "second"]) Out[9]: MultiIndex([('bar', 'one'), ('bar', 'two'), ('baz', 'one'), ('baz', 'two'), ('foo', 'one'), ('foo', 'two'), ('qux', 'one'), ('qux', 'two')], names=['first'...
In [1]: import numba In [2]: def double_every_value_nonumba(x): return x * 2 In [3]: @numba.vectorize def double_every_value_withnumba(x): return x * 2 # 不带numba的自定义函数: 797 us In [4]: %timeit df["col1_doubled"] = df["a"].apply(double_every_value_nonumba) ...
Ordered by: internal timeListreducedfrom161to4due to restriction <4> ncalls tottime percall cumtime percall filename:lineno(function)30000.0030.0000.0120.000series.py:1095(__getitem__)30000.0020.0000.0050.000series.py:1220(_get_value)30000.0020.0000.0020.000base.py:3777(get_loc)30000.0020.0000.0020...
[i].copy(deep=False) Cell In[25], line 2, in f(s) 1 def f(s): ---> 2 s.pop("a") 3 return s File ~/work/pandas/pandas/pandas/core/series.py:5391, in Series.pop(self, item) 5366 def pop(self, item: Hashable) -> Any: 5367 """ 5368 Return item and drops from serie...
Cell In[70], line 1 ---> 1 pd.Series(['foo', 'bar', 'baz']) == pd.Series(['foo']) File ~/work/pandas/pandas/pandas/core/ops/common.py:76, in _unpack_zerodim_and_defer.<locals>.new_method(self, other) 72 return NotImplemented 74 other = item_from_zerodim(other) --->...
(mostrecentcalllast)CellIn[26],line1--->1s["f"]File~/work/pandas/pandas/pandas/core/series.py:1121,inSeries.__getitem__(self,key)1118returnself._values[key]1120elifkey_is_scalar:->1121returnself._get_value(key)1123# Convert generator to list before going through hashable part1124# (We...
Cell In[4], line1--->1s1.reindex(["a","b","c"]) File ~/work/pandas/pandas/pandas/core/series.py:5153,inSeries.reindex(self, index, axis, method, copy, level, fill_value, limit, tolerance)5136@doc(5137NDFrame.reindex,# type: ignore[has-type]5138klass=_shared_doc_kwargs["klass...
或许说它可能有点像matlab的矩阵,但是matlab的矩阵只能放数值型值(当然matlab也可以用cell存放多类型数据),DataFrame的单元格可以存放数值、字符串等,这和excel表很像。 同时DataFrame可以设置列名columns与行名index,可以通过像matlab一...python pandas dataframe pandas 的数据结构分:Serial ,Dataframe,Serial类似于...
Write a Pandas program to set a given value for particular cell in DataFrame using index value. Sample data: Original DataFrame attempts name qualify score 0 1 Anastasia yes 12.5 1 3 Dima no 9.0 2 2 Katherine yes 16.5 ... 8 2 Kevin no 8.0 9 1 Jonas yes 19.0 Set a given value...