Python---function call

import sys
def util_test(string):
''' parameter description:
string: string of object
return none
'''
print(string)

list1=['1',2,3,4]

def built():
hello()
def is_less_than10(number):
if number < 10:
return 1
else:
return 0

def is_between_5_to_15(number):
if not (5<number<15):
return 0
else:
return 1

if __name__ == '__main__':
util_test('this is util test function')

import sys
import util_m
import fractions
import math
def my_test(name, age = 20):
''' parameter description:
name: name of object
age: age of object
return none
'''
print(name)
print(age)
print('aa')
if age < 20:
raise ValueError('age should be max or equal to 20')

print('aa')
if __name__ == '__main__':
try:
my_test('xfei',21)
except ValueError:
printf('error happen')

try:
my_test('jang',18)
except ValueError:
print('error happen')

print(util_m.util_test.__doc__)
print(util_m.__name__)

print(isinstance(1, int))
print(isinstance(True, bool))
print(isinstance(1.0, float))
if 0:
print(1==2)
else:
print(1==1)

print(11/2)
print(11//2)
print(11.0//2)
print(11**2)
print(11%2)
x=fractions.Fraction(2,6)
print(x)
print(x*2)

print(math.sin(math.pi/2))
print(math.tan(math.pi/4))