print('hello world', 'test')

print('1+1=', 1+1)
print('100 + 200 =', 100 + 200)

a = 100
if a >= 0:
    print(a)
else:
    print(-a)
print(r'\\\\')
print('''line1
...line2
      ...line3
      ''')

classmate= ['xiaoming','xiaohua']
print(classmate)
print (len(classmate))
print(classmate[-1])
classmate.append('hello')
print(classmate)

t = ("dd",)
print(t)
