range (1,30,1) - will start the range of values from 1 and end at 29
range (2,30,2) - will start the range of values from 2 and end at 28
range (30,3,-3) - will start the range of values from 30 and end at 6
range (20) - will consider this value 20 as the end value(or upper limit) and starts the range count from 0 to 19 (remember always ranget) will work till stop -1 value only)

for var in sequence:
# code inside for loop
if condition:

while test expression:
#code inside while loop
if condition:

Program:
ch=input ("Enter a character :")
# to check if the letter is vowel
if ch in ('a', 'A', 'e', 'E', 'i', 'I', 'o', 'O', 'u', 'U'):
print (ch,' is a vowel')
# to check if the letter typed is not 'a' or 'b' or 'c'
if ch not in ('a', 'b', 'c'):
print (ch,' the letter is not a/b/c')
Output 1:
Enter a character: e
e is a vowel
Output 2:
Enter a character :x
x the letter is not a/b/c

Simple if statement: Simple if is the simplest of all decision making statements. Condition should be in the form of relational or logical expression.
Syntax:
if :
statements-block1
In the above syntax if the condition is true statements - block 1 will be executed.
Example: Program to check the age and print whether eligible for voting
x=int (input("Enter your age :"))
if x > = 18:
print ("You are eligible for voting")
Output 1:
Enter your age: 34
You are eligible for voting
Output 2:
Enter your age: 16
>>>