替换值replace

from pandas import Series
import numpy as np

data = Series([1,-999,2,-999,-1000,3])
print(data)
'''
0       1
1    -999
2       2
3    -999
4   -1000
5       3
dtype: int64
'''
print(data.replace(-999,np.nan))
'''
0       1.0
1       NaN
2       2.0
3       NaN
4   -1000.0
5       3.0
dtype: float64
'''
# 一次性替换多个值
print(data.replace([-999,-1000],np.nan))
'''
0    1.0
1    NaN
2    2.0
3    NaN
4    NaN
5    3.0
dtype: float64
'''
# 不同的值进行不同的替换
print(data.replace([-999,-1000],[np.nan,0]))
'''
0    1.0
1    NaN
2    2.0
3    NaN
4    0.0
5    3.0
dtype: float64
'''
# 传入的参数也可以是字典
print(data.replace({-999:np.nan,-1000:0}))
'''
0    1.0
1    NaN
2    2.0
3    NaN
4    0.0
5    3.0
dtype: float64
'''