python USES pickle module to realize the simple function of "add delete change and check"
- 2020-06-03 07:08:49
- OfStack
The role of pickle:
1: pickle.dump(dict,file) converts the dictionary to base 2 and stores it in a file.
2: pickle. load(file) converts the file's base 2 content into a dictionary
import pickle
# increase
def adds():
users = {"name":"yangbin", "age":22, "sex":"male"}
with open("red.txt", "wb") as f:
pickle.dump(users, f)
dic = {}
with open("red.txt") as sd:
dic = pickle.load(sd)
print dic
# delete
def deletes():
dic = {}
with open("red.txt") as f:
dic = pickle.load(f)
dic.pop("sex")
with open("red.txt", "wb") as ff:
pickle.dump(dic, ff)
print dic
# change
def changes():
dic = {}
with open("red.txt") as f:
dic = pickle.load(f)
dic["age"] = 28
with open("red.txt", "wb") as f:
pickle.dump(dic, f)
print dic
# check
def finds():
dic = {}
with open("red.txt") as f:
dic = pickle.load(f)
for k,v in dic.items():
print "%s ---> %s" % (k, v)
adds()
deletes()
changes()
finds()
Operation results:
root@python3:/python/python2/linshi# python 01.py
{'age': 22, 'name': 'yangbin', 'sex': 'male'}
{'age': 22, 'name': 'yangbin'}
{'age': 28, 'name': 'yangbin'}
age ---> 28
name ---> yangbin
root@python3:/python/python2/linshi#