How to create an 'empty if statement' in Python

It's very common in C: hacking 'empty if statement' like this:

if(mostlyhappencondition)
    ;#empty statement
else{
    dosomething;
}

Is it working in Python? I mean, can we improve the application's performance by using that? I'd also like to know why.

There is a performance improvement if there isn't an else case in the "if", since the bytecodes don't pass execution into the "if" case.

Here are some functions and the output of dis.dis(foo).

The following sample application:

def foo(x):
    if x:
        pass
    else:
        return x+2

Disassembles to:

5           0 LOAD_FAST                0 (x)
            3 POP_JUMP_IF_FALSE        9

6           6 JUMP_FORWARD             8 (to 17)

8     >>    9 LOAD_FAST                0 (x)
           12 LOAD_CONST               1 (2)
           15 BINARY_ADD
           16 RETURN_VALUE
      >>   17 LOAD_CONST               0 (None)
           20 RETURN_VALUE

The following

def foo(x):
    if not x:
        return x+2

Disassembles to:

11           0 LOAD_FAST                0 (x)
             3 POP_JUMP_IF_TRUE        14

12           6 LOAD_FAST                0 (x)
             9 LOAD_CONST               1 (2)
            12 BINARY_ADD
            13 RETURN_VALUE
       >>   14 LOAD_CONST               0 (None)