Python equivalent for && (logical and) to use in if statement

This tutorial guides you on Python equivalent for && (logical and) to use in if condition statements. Let’s learn what option does Python provide for logical and operation.

Python equivalent for && (logical and)

The logical and (&&) operator for a set of operands results in true only if all of its operands are true else it results in false. But when used && operator in Python it resulted in error as shown below.

listOfLists = []
myfirstlist = []
mysecondlist = []
n = 10
for i in range (0,n):
    myfirstlist.append(i)    
    mysecondlist.append(n-i)
    if (len(myfirstlist) > 3) && (len(mysecondlist) > 3):
        myfirstlist.remove(myfirstlist[0])  
        mysecondlist.remove(mysecondlist[0])   
        listOfLists.append((list(myfirstlist), mysecondlist))
print (listOfLists)

Output

File "<ipython-input-8-c87a0099c69d>", line 8
    if (len(myfirstlist) > 3) && (len(mysecondlist) > 3):
                               ^
SyntaxError: invalid syntax

Python logical (and) operators

Basically, Python logical operators are used to combine conditional statements. The following are the logical operators supported in Python.

1. and – it is used to return if both the operands or statements are true.
2. or – it is used to return if one of the operands or statements is true.
3. not – used to reverse the result, it returns false if the result is true.

Note, Python also supports bitwise operators, which are used to compare binary numbers.

The operator (&) – AND : is a bitwise AND operator used to set each bit to 1 if both bits are 1. Therefore, we need to use logical and (and) in our case.

Let’s see whether you get expected results when you use logical and (and) operator which is Python equivalent to && operator in other languages.

For example,

listOfLists = []
myfirstlist = []
mysecondlist = []
n = 10
for i in range (0,n):
    myfirstlist.append(i)    
    mysecondlist.append(n-i)
    if (len(myfirstlist) > 3) and (len(mysecondlist) > 3):
        myfirstlist.remove(myfirstlist[0])  
        mysecondlist.remove(mysecondlist[0])   
        listOfLists.append((list(myfirstlist), mysecondlist))
print (listOfLists)

Output

[([1, 2, 3], [3, 2, 1]), ([2, 3, 4], [3, 2, 1]), ([3, 4, 5], [3, 2, 1]), 
([4, 5, 6], [3, 2, 1]), ([5, 6, 7], [3, 2, 1]), ([6, 7, 8], [3, 2, 1]), ([7, 8, 9], [3, 2, 1])]

That’s it. Basically, you had learnt Python equivalent for && (logical and) and how to use in if statements.

Hope it is helpful 🙂

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References

• python documentation
• wiki