list:
>>> a = [1,2,3,4]
>>> a[0]
1
>>> a[1]
2
>>> a[0] = 10
>>> a
[10, 2, 3, 4]def type_list(x):
x[0] = 10
print xif __name__ == '__main__':
a = [1,2,3,4]
type_list(a)
print a
[10,2,3,4]
[10,2,3,4]
tuple:
tuple:
>>> a = (1,2,3,4)
>>> a[0]
1
>>> a[1]
2
>>> a[0] = 10
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment
def type_tuple(x):
x[0] = 10
print xif __name__ == '__main__':
a = (1,2,3,4)
type_tuple(a)
print aTraceback (most recent call last):
File "type_tuple.py", line 7, in <module>
type_tuple(a)
File "type_tuple.py", line 2, in type_tuple
x[0] = 10
TypeError: 'tuple' object does not support item assignment
dict:
>>> a = {'tom':97, 'lisa':85}
>>> a['tom']
97
>>> a['tom'] = 75
>>> a
{'lisa': 85, 'tom': 75}def type_list(x):
x['tom'] = 75
print xif __name__ == '__main__':
a = {'tom':98, 'lisa':85}
type_list(a)
print a{'lisa': 85, 'tom': 75}
{'lisa': 85, 'tom': 75}
string:
>>> a = 'abcd'
>>> a[0]
'a'
>>> a[1]
'b'
>>> a[2]
'c'
>>> a[0] = 'b'
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'str' object does not support item assignment
def type_str(x):
x = 'bbbb'
print xif __name__ == '__main__':
a = 'abcd'
type_str(a)
print abbbb
abcd
number:
def type_number(x):
x = 100
print xif __name__ == '__main__':
a = 1
type_number(a)
print a
100
1