pandas创建series的三种方法小结

print("====创建series方法一===")
dic={"a":1,"b":2,"c":3,"4":4}
s=pd.Series(dic)
print(s)

arr=np.random.rand(5)
s=pd.Series(arr)
print(arr)
print(s)
#默认index是从0开始，步长为1的数字
s=pd.Series(arr,index=['a','b','c','d','e'],dtype=np.object)
print(s)

s=pd.Series(10,index=range(4))
print(s)

from pandas import Series

>>> obj = Series([1,2,3], index=['A','B','C'])
>>> obj
A    1
B    2
C    3
dtype: int64

>>> obj = Series({'a':1,'b':2,'c':3})
>>> obj
a    1
b    2
c    3
dtype: int64

>>> obj1 = Series([1,2,3],index=['a','b','c'])
>>> obj2 = Series([4,5,6],index=['d','e','f'])
>>> obj3 = Series([obj1, obj2],index=['name1', 'name2'])
>>> obj3
name1    a    1
b    2
c    3
dtype: int64
name2    d    4
e    5
f    6
dtype: int64
dtype: object

>>> obj1 = Series([1,2,3],index=['a','b','c'])
>>> obj1
a    1
b    2
c    3
dtype: int64
>>> obj1.append(Series([4,5],index=['d','e']))
a    1
b    2
c    3
d    4
e    5
dtype: int64

>>> obj1 = Series([1,2,3],index=['a','b','c'])
>>> obj1
a    1
b    2
c    3
dtype: int64
>>> obj1.drop('b')
a    1
c    3
dtype: int64

>>> obj1 = Series([1,2,3],index=['a','b','c'])
>>> obj1
a    1
b    2
c    3
dtype: int64
>>> obj1.a = -1
>>> obj1['b'] = -2
>>> obj1
a   -1
b   -2
c    3
dtype: int64

>>> obj1 = Series([1,2,3],index=['a','b','c'])
>>> obj1
a    1
b    2
c    3
dtype: int64
>>> print(obj1.a == 1)
True