Python Articles - Page 957 of 1048

If you want to convert a statement like −if :    to a single line, You can use the single line if syntax to do so −if : Another way to do this is leveraging the short-circuiting and operator like − and If is false, then short-circuiting will kick in and the right-hand side won't be evaluated. If is true, then the right-hand side will be evaluated and will be evaluated.

Reversed set operators are operators that are defined as:s & z corresponds to s.__and__(z) z & s corresponds to s.__rand__(z)These don't make much sense in normal operations like and, add, or, etc of simple objects. However in case of inheritence, reversed operations are particularly useful when dealing with subclasses because if the right operand is a subclass of the left operand the reversed operation is attempted first. You may have different implementations in parent and child classes.These reversed operations are also used if the first operand returns NotImplemented.

If you want to get an inversion of only first 16 bits of a number, you can take a xor of that number with 65535(16 1s in binary). examplea = 3 # 11 in binary b = a ^ 65535 print(bin(b))OutputThis will give the output −0b1111111111111100

If you want to get an inversion of only first 16 bits of a number, you can take a xor of that number with 65535(16 1s in binary). Forgetting a 2s complement, just add one to the result. For example,Examplea = 3 # 11 in binary b = (a ^ 65535) + 1 print(bin(b))OutputThis will give the output:0b1111111111111101

No this cannot be done. It's part of the Python language itself. That's how the language parses the expressions and builds parse and syntax trees. From the documentation:When performing mathematical operations with mixed operators, it is important to note that Python determines which operations to perform first, based on a pre-determined precedence. This precedence follows a similar precedence to most programming languages.

Python and most mainstream languages do not allow changing how operators look. If you're trying to replace something like a == b with a equals b, you can't do that. In Python the restriction is quite intentional — an expression such as a equals b would look ungrammatical to any reader familiar with Python.

The easiest and most readable way to access nested properties in a Python dict is to use for loop and loop over each item while getting the next value, until the end. exampledef getFromDict(dataDict, mapList): for k in mapList: dataDict = dataDict[k] return dataDict a = {    'foo': 45,'bar': {       'baz': 100,'tru': "Hello"    } } print(getFromDict(a, ["bar", "baz"]))OutputThis will give the output −100

You can put comments like you normally would anywhere in a python script. But note that you can only put single line comments using #. Multiline comments act like strings and you cannot put just a string in between definition of a dict. For example, the following declaration is perfectly valid −ExampletestItems = {    'TestOne': 'Hello',    # 'TestTwo': None, }But the following is not −testItems = {    'TestOne': 'Hello',    """    Some random    multiline comment    """ }

You can put comments like you normally would anywhere in a python script. But note that you can only put single line comments using #. Multiline comments act like strings and you cannot put just a string in between definition of a dict. For example, the following declaration is perfectly valid:testItems = {    'TestOne': 'Hello',    # 'TestTwo': None, }But the following is not:testItems = {    'TestOne': 'Hello',    """    Some random    multiline comment    """ }

You can use the del function to delete a specific key or loop through all keys and delete them. For example,my_dict = {'name': 'foo', 'age': 28} keys = list(my_dict.keys()) for key in keys:    del my_dict[key] print(my_dict)This will give the output:{}You can also use the pop function to delete a specific key or loop through all keys and delete them. For example,my_dict = {'name': 'foo', 'age': 28} keys = list(my_dict.keys())for key in keys:my_dict.pop(key) print(my_dict)This will give the output:{}