Using only `if`¶

x=0

if x > 0:
    sign = "Positive!"
if x < 0:
    sign = "Negative!"
if x==0: 
    sign = "Zero!"
    
print(sign)

Using `elif`¶

x=0

if x > 0:
    sign = "Positive!"
elif x < 0:
    sign = "Negative!"
else: sign = "Zero!"
    
print(sign)

Alternative:¶

x=0

sign=None
if x > 0:
    sign = "Positive!"
if x < 0:
    sign = "Negative!"
    
print(sign)