How to convert data types in python

When processing data, it is often necessary to convert the format of the data to facilitate operations such as data traversal. Let's take a look at several data type conversions in Python.

1. Convert string to dictionary:

dict_string = "{'name':'linux','age':18}"
to_dict = eval(dict_string)
print(type(to_dict))

You can also use json for conversion

import json #如果是Python2.6应该是simplejson
dict_string = "{'name':'linux','age':18}"
to_dict = json.loads(dict_string.replace("\‘","\“")) #这里需要将字符串的单引号转换成双引号，不然json模块会报错的
print(type(to_dict))

2. Convert dictionary to string

Similarly You can use json

import json
dict_1 = {'name':'linux','age':18}
dict_string = json.dumps(dict_1)
print(type(dict_string))

Of course, you can also directly use str to force conversion

dict_1 = {'name':'linux','age':18}
dict_string = str(dict_1)
print(type(dict_string))

3. String to list

Specify the delimiter

string1 = "1,2,3,4,5,'aa',12"
print(type(string1.split(',')))

If it is already List format, just use eval directly

string2 = "[1,2,3,4,5,'aa',12]"
print(type(eval(string2)))

4. Convert list to string

Use str directly to force conversion

print(type(str([1, 2,3,4,5,'aa',12])))

Specify the separator. Note that the lists here need to be of string type, otherwise an error will be reported during splicing

print(type("--".join(['a','b','c'])))

5. Convert list to dictionary

Two List, list1 = ['k1','k2','k3'], list2 = [1,2,3], converted into dictionary {'k1':1,'k2':2,'k3':3}

list1 = ['k1','k2','k3']
list2 = [1,2,3]
print(dict(zip(list1,list2)))

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