numpy arrays

creating a numpy array

import numpy as np
lst=[1,2,3,4];
a1=np.array(lst);
print(a1);

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creating series object from a sequence

import pandas as pd;
src=pd.Series([1,2,3,4]);
print(src);

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creating series object from ndarray

import pandas as pd;
import numpy as np;
nda1=np.arange(3,13,3.5);
print(nda1);
ser1=pd.Series(nda1);
print(ser1);

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creating series object from dictionary

import pandas as pd;
ser1=pd.Series({"1":"raman","2":"gagan","3":"aman"});
print(ser1);

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specifying NaN values in a Series object

import pandas as pd;
import numpy as np;
ser1=pd.Series([2,3,np.NaN,4]);
print(ser1);


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creating series with specifying data and indexes

import pandas as pd;
import numpy as np;
arr=[31,28,31,30];
mon=["Jan","Feb","Mar","Apr"];
ser1=pd.Series(data=arr,index=mon);
print(ser1);

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creating series object by specifying datatype,data and index

import pandas as pd;
import numpy as np;
arr=[31,28,31,30];
mon=["Jan","Feb","Mar","Apr"];
ser1=pd.Series(data=arr,index=mon,dtype=np.float64);
print(ser1);

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creating series obect using a mathematical function or expression

import pandas as pd;
import numpy as np;
a=np.arange(9,13);
ob7=pd.Series(index=a,data=a*2);
print(ob7);

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create a series  by adding data to a series

import pandas as pd;
lst=[1,2,3,4];
ob7=pd.Series(data=(2*lst));
print(ob7);
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modify a value in series object 

import pandas as pd;
ob7=pd.Series([1,2,3,4]);
print(ob7);
ob7[2]=12;
print(ob7);
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access individual element in series object

import pandas as pd;
ob7=pd.Series([1,2,3,4]);
print(ob7[2]);

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extract slices from series obbject

import pandas as pd;
ob7=pd.Series([1,2,3,4]);
print(ob7[2:4]);

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head function of series object

import pandas as pd;
ob7=pd.Series([1,2,3,4,5,6,7,8,9,10]);
print(ob7.head());

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tail function of series object

import pandas as pd;
ob7=pd.Series([1,2,3,4,5,6,7,8,9,10]);
print(ob7.tail());

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vector operation on series object (+) operation

import pandas as pd;
ob7=pd.Series([1,2,3,4,5,6,7,8,9,10]);
print(ob7+2);

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* operation

import pandas as pd;
ob7=pd.Series([1,2,3,4,5,6,7,8,9,10]);
print(ob7*2);

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** operation

import pandas as pd;
ob7=pd.Series([1,2,3,4,5,6,7,8,9,10]);
print(ob7**2);

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arithmetic operation add(+) on series objects

import pandas as pd;
ob7=pd.Series([1,2,3,4,5,6,7,8,9,10]);
ob8=pd.Series([2,3,4,5,6,7,8,9,10,11]);
ob9=ob7+ob8;
print(ob9);

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- operation on series objects

import pandas as pd;
ob7=pd.Series([1,2,3,4,5,6,7,8,9,10]);
ob8=pd.Series([2,3,4,5,6,7,8,9,10,11]);
ob9=ob7-ob8;
print(ob9);

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* operation on series object

import pandas as pd;
ob7=pd.Series([1,2,3,4,5,6,7,8,9,10]);
ob8=pd.Series([2,3,4,5,6,7,8,9,10,11]);
ob9=ob7*ob8;
print(ob9);

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/ operation on series object

import pandas as pd;
ob7=pd.Series([1,2,3,4,5,6,7,8,9,10]);
ob8=pd.Series([2,3,4,5,6,7,8,9,10,11]);
ob9=ob7/ob8;
print(ob9);

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filtering entries

import pandas as pd;
ob7=pd.Series([1,2,3,4,5,6,7,8,9,10]);
print(ob7>2);

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