利用df.apply(fun,axis=1)对每行数据遍历判断是否包含4或者5，当if value==4 or value==5时，则r...
import pandas as pddata = {'姓名': ['Alice', 'Bob', 'Charlie', 'David']}df = pd.DataFrame(data, index=['A', 'B', 'C', 'D'])row_index = df.index# 获取Index对象的值index_values = row_index.valuesprint("Index对象的值:", index_values)# 将Index对象转换为列表index_list = r...
df = pd.DataFrame(data) 使用if语句逐行执行操作:可以使用Pandas的apply方法结合if语句逐行执行操作。apply方法可以将自定义的函数应用到DataFrame的每一行或每一列上。以下是一个示例代码: 代码语言:txt 复制 def process_row(row): if row['Age'] < 30: return 'Young' else: return 'Old' df['Age Group...
1. fill_value 使用add,sub,div,mul的同时,通过fill_value指定填充值,未对齐的数据将和填充值做运算 示例代码: print(s1) print(s2) s1.add(s2, fill_value = -1) print(df1) print(df2) df1.sub(df2, fill_value = 2.) 运行结果: # print(s1) 0 10 1 11 2 12 3 13 4 14 5 15 6 16 ...
(self, key, value) File ~/work/pandas/pandas/pandas/core/flags.py:96, in Flags.allows_duplicate_labels(self, value) 94 if not value: 95 for ax in obj.axes: ---> 96 ax._maybe_check_unique() 98 self._allows_duplicate_labels = value File ~/work/pandas/pandas/pandas/core/indexes/...
if isinstance(key, Period): if key.freq != self.freq: return False else: return key.ordinal in self._engine else: try: self.get_loc(key) return True except Exception: return False contains = __contains__ @cache_readonly def _int64index(self): return Int64Index._simple_new(self.asi8...
df.apply(pd.Series.value_counts) 4. 数据处理 4.1 重命名列名 4.2 选择性更改列名 4.3 批量更改索引 4.4 批量更改列名 4.5 设置姓名列为行索引 4.6 检查哪些列包含缺失值 4.7 统计各列空值 4.8 删除本列中空值的行 4.9 仅保留本列中是空值的行
__contains__(other): return True try: # if other is a sequence this throws a ValueError return np.isnan(other) and self.hasnans except ValueError: try: return len(other) <= 1 and ibase._try_get_item(other) in self except TypeError: pass except TypeError: pass return False @...
Pandas - Replacing whole string if it contains substring For this purpose, we will use thestr.contains()method to mask the rows that contain the old substring and then overwrite with the new value (i.e., new string to be replaced with old one). Consider the below code statement to achie...
Example: Check if Value Exists in pandas DataFrame Using values Attribute The following Python programming syntax shows how to test whether a pandas DataFrame contains a particular number. The following Python code searches for the value 5 in our data set: ...