10个示例带你掌握python中的元组

a=(3,4)
print (a)
print (type(a))
# (3, 4)
# <class 'tuple'>

a = (3, 3, 'x', [1,2])
print (a)
# (3, 3, 'x', [1, 2])
print (type(a))
# <class 'tuple'>

a = 3, 4, 5, 6
print (type(a))
# <class 'tuple'>

a = ()
print (type(a))
# <class 'tuple'>

a = (3)
print (type(a))
# <class 'int'>
b = ([1,2])
print (type(b))
# <class 'list'>

a = (3,)
print (type(a))
# <class 'tuple'>
b = ([1,2],)
print (type(b))
# <class 'tuple'>

a = (1, 2, 3)
for i in a:
   print (i**2)
   '''
   1
   4
   9
   '''

a = (3, 5, 'x', 5)
print (a[0])
print (a[-1])
# 3
# 5

a = (1, 2, 5, 6, 7)
print (a[-2:])
# (6, 7)
print (a[:3])
# (1, 2, 5)

a = (3, 5, 'x', 5)
a[0] = 7 
# error

a = ([1,2], ['x', 'y'])
a[0][0] = 99
a[1][0] = 't'
print (a)
# ([99, 2], ['t', 'y'])

a = (3, 5, 8, 2)
b = sorted(a)
print (b)
# [2, 3, 5, 8]
print (type(b))
# <class 'list'>

a = (3, 0, 2)
print (len(a))
# 3

a = (3, 0, 2)
print (max(a))
print (min(a))
# 3
# 0

a = [1,2,3,4]
print (tuple(a))
# (1,2,3,4)

a = (1, 'x', 1, 1, 'x')
print (a.count('x'))
# 2
print (a.count(1))
# 3

a = (1, 'x', 3, 5, 'x')
print (a.index('x'))
# 1
print (a.index(1))
# 0

a = (1, 2)
b = ('x', 'y')
c = a + b
print (c)
# (1, 2, 'x', 'y')

def count_sum(arr):
   count = len(arr)
   sum = arr.sum()
   return count, sum

import numpy as np
arr = np.random.randint(10, size=8)
def count_sum(arr):
   count = len(arr)
   sum = arr.sum()
   return count, sum
a = count_sum(arr)
print (a)
# (8, 39)
print (type(a))
# <class 'tuple'>