swift if or/and statement like python

You can use

&&

for logical and

||

for logical or

so you can do

if a > 0 && i == j || f < 3 {
    ...
}

see here https://developer.apple.com/library/ios/documentation/swift/conceptual/Swift_Programming_Language/BasicOperators.html

Yes.

if (a > 0 && i == j || f < 3){
    //do something
}

You should probably do some reading on the basics of Swift before jumping in. If statements are covered in there.

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