• What is the difference between datetime.now( ) and datetime.today( ) in Python

    Both methods give current local date and time by default. The method datetime.now( ) takes tz (stands for timezone) as keyword argument but datetime.today( ) does not take any arguments. By default, datetime.now( ) executes with datetime.now(tz=None)
  • Differences between a list and an array in python

      list
      • A list is a container of objects and can hold elements of different data types
      • Lists are built-in data types in python, so no import is needed to use them
      • A list is flexible and can be changed after its creation.
      • Some arithmetic operations are supported and they are not element-wise
      • An entire list can be printed without a loop
      • A list does not use memory efficiently and is typically slower than an array
      array
      • An array is a container of objects and can hold elements of the same data type only
      • Arrays are not built-in data types in python, so an import is needed to use them
      • Once an array is defined, its size is fixed and cannot be changed
      • All arithmetic operations are supported and are element-wise
      • A loop is needed to print an entire array
      • An array uses memory efficiently and is typically faster than a list
      Though lists and arrays are containers of data and can be indexed and sliced, there are many differences between them:
      A list is a container of objects and can hold elements having different data types.
      An array is a container of objects and can hold elements of the same data type only.
      Lists are built-in data types in python, so no import is needed to use them
      Arrays are not built-in data types in python, so an import is needed to use them
      Not all arithmetic operations are supported and supported ones are not element-wise
      All arithmetic operations are supported and are element-wise
      A list is flexible and can change after its creation. Elements can be added, deleted or modified
      Once the array is defined, the space it occupies in memory, a combination of the number of its elements and the size of each element, is fixed and cannot be changed. The only thing you can do is to create a new array and replace some of its elements by the elements of the original array.
      An entire list can be printed without a loop
      A loop is needed to print an entire array
      A list does not use memory efficiently and is typically slower than an array
      An array uses memory efficiently and is typically faster than a list


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