One-line list comprehension: if-else variants
x if y else z is the syntax for the expression you're returning for each element. Thus you need:
[ x if x%2 else x*100 for x in range(1, 10) ]The confusion arises from the fact you're using a filter in the first example, but not in the second. In the second example you're only mapping each value to another, using a ternary-operator expression.
With a filter, you need:
[ EXP for x in seq if COND ]Without a filter you need:
[ EXP for x in seq ]and in your second example, the expression is a "complex" one, which happens to involve an if-else.
[x if x % 2 else x * 100 for x in range(1, 10) ]
You can do that with list comprehension too:
A=[[x*100, x][x % 2 != 0] for x in range(1,11)]print A