Change dtype of dataframe column

    • Change Data Type for one or more columns in Pandas Dataframe

      A DataFrame is similar to a fixed-size dict because you can use the index labels to get and set values. ... it can’t deal with duplicate values for one index/column pair. pivot_table is a generalization of pivot that can handle duplicate values for one pivoted index/column pair. ... Write mysql command to change name ‘Aman’ by new name ...

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      (a single value) selects a column by its . key. key could be a number, if column names weren’t given when setting up the data frame. Slicing. selects . rows. by number. indexing with a . list. gives multiple columns.iloc gives row/column indices (like an array)

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      Slice the modified dataframe column and apply summarization functions one at a time using ‘groupby’ pandas method. Pass the indexes as a list to the groupby function. For eg: if count, sum and weighted average are values to be calculated - create a data type of dtype for each of the 3 functions.

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      Dfobject.iteritems(): it represents dataframe column-wise (ii).Sorting means arranging the contents in ascending and descending order , contents of dataframe also be sorted according to values of row and columns.there are two to sort in Pandas(dataframe) 1.

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      Dataframe.aggregate() function is used to apply some aggregation across one or more column. Aggregate using callable, string, dict, or list of string/callables. Most frequently used aggregations are: sum: Return the sum of the values for the requested axis. min: Return the …

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      pivot() is used for pivoting without aggregation. Therefor, it can’t deal with duplicate values for one index/column pair. The pivot table takes simple column-wise data as input, and groups the entries into a two-dimensional table that provides a multidimensional summarization of the data.

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      Write a query to change the city to rohtak of employee whose employee no is 104. ... dtype: int64. 2. g) Write python statement to create a two- dimensional array of 4 rows and 3 columns . The array should be filled with ones. ... column or row of a Series or Dataframe : 1 (i) rename() (ii) reindex()

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