A group of individual statements, which make a single code block are called suites in Python. Compound or complex statements, such as if, while, def, and class require a header line and a suite.
Header lines begin the statement (with the keyword) and terminate with a colon (: ) and are followed by one or more lines which make up the suite.
example
if expr1==True: stmt1 stmt2 elif expr2==True: stmt3 stmt4 else: stmt5 stmt6
while expr==True: stmt1 stmt2