How to get row number in dataframe in Pandas

Question

How can I get the number of the row in a dataframe that contains a certain value in a certain column using Pandas  For example  I have the following dataframe        ClientID  LastName 0    34        Johnson 1    67        Smith 2    53        Brows     How can I find the number of the row that has  Smith  in  LastName  column

User · Answer

df index df LastName     Smith     Or  df query  LastName     Smith    index   Will return all row indices where LastName is Smith  Int64Index  1   dtype  int64

User · Answer

count smiths    df  LastName       Smith   sum

User · Answer

df loc df LastName     Smith     will return the row      ClientID    LastName 1   67          Smith   and   df loc df LastName     Smith   index   will return the index  Int64Index  1   dtype  int64     NOTE  Column names  LastName  and  Last Name  or even  lastname  are three unique names  The best practice would be to first check the exact name using df columns  If you really need to strip the column names of all the white spaces  you can first do  df columns    x strip   replace          for x in df columns

User · Answer

To get all indices that matches  Smith    gt  gt  gt  df df  LastName       Smith   index Int64Index  1   dtype  int64     or as a numpy array   gt  gt  gt  df df  LastName       Smith   index to numpy       values on older versions array  1     or if there is only one and you want the integer  you can subset   gt  gt  gt  df df  LastName       Smith   index 0  1   You could use the same boolean expressions with  loc  but it is not needed unless you also want to select a certain column  which is redundant when you only want the row number index

User · Answer

You can simply use shape method df df  LastName       Smith   shape  Output  1 1     Which indicates 1 row and 1 column  This way you can get the idea of whole datasets  Let me explain the above code DataframeName DataframeName  Column name       Value to match in column

User · Answer

len df df  Lastname     Smith   values

[python] How to get row number in dataframe in Pandas?

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