Python realizes the mutual conversion among list tuple str and dict

1. Dictionary (dict)

dict = { ' name':  ' Zara',  ' age': 7,  ' class':  ' First'}

1.1 Dictionary-String

Return to:

print type(str(dict)), str(dict)

1.2 Dictionary-Tuples

Returns: ('age', 'name', 'class')

print tuple(dict)

1.3 Dictionary-Tuples

Return: (7, 'Zara', 'First')

print tuple(dict.values())

1.4 Dictionary-List

Return: ['age', 'name', 'class']

print list(dict)

1.5 Dictionary-List

print dict.values

2. Tuples

tup=(1, 2, 3, 4, 5)

2.1 Tuple-String

Return: (1, 2, 3, 4, 5)

print tup.__str__()

2.2 tuple-list

Return: [1, 2, 3, 4, 5]

print list(tup)

2.3 Tuples cannot be converted to dictionaries

3. List

nums=[1, 3, 5, 7, 8, 13, 20];

3.1 List-String

Return: [1, 3, 5, 7, 8, 13, 20]

print type(str(dict)), str(dict)

0

3.2 List-Tuples

Return: (1, 3, 5, 7, 8, 13, 20)

print type(str(dict)), str(dict)

1

3.3 Lists cannot be converted to dictionaries

4. String

4.1 String--Tuples

Return: (1, 2, 3)

print type(str(dict)), str(dict)

2

4.2 String--List

Return: [1, 2, 3]

print list(eval("(1,2,3)"))

4.3 String--Dictionary

Return to:

print type(str(dict)), str(dict)

4

Supplement: python Getting Started: 1 Small Mistake, str Changed to tuple

When I was programming, I found that the original definition of str string will inexplicably change its type and become tuple when passing and referencing.

print type(str(dict)), str(dict)

5

Here the random_char function outputs a random string, and you can see that the type type is:

print type(str(dict)), str(dict)

6

Reference in another file:

print type(str(dict)), str(dict)

7

It is found that the type type of random_char has changed:

<class 'tuple'>

It's just a simple assignment. Why did it change?

The reason is that an extra comma is added when assigning values.

This comma is understood by the compiler when it executes ("str",)