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
- 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
- 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:
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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 |