Basic knowledge of the Python dictionary and basic knowledge of the python dictionary

Basic knowledge of the Python dictionary and basic knowledge of the python dictionary
1. Add a key-Value Pair

#! /Usr/bin/env pythoni1 = {'k1 ': 'cai', 'k2': 123} print (i1) i1 ['k3 '] = 0i1 ['k4'] = "rui" print (i1) ================================================================={ 'k1 ': 'cai ', 'k2': 123} {'k1': 'cai ', 'k2': 123, 'k3': 0, 'k4 ': 'rui '}

 

2. Modify the value in the dictionary

#! /Usr/bin/env pythoni1 = {'k1 ': 'cai', 'k2': 123} print (i1) i1 ['k1 '] = 'rui' print (i1) ================================={ 'k1 ': 'cai ', 'k2': 123} {'k1': 'rui', 'k2': 123}

3. delete key-value pairs

I1 = {'k1 ': 'cai', 'k2 ': 123} print (i1) del i1 ['k1'] print (i1) ================================================================={ 'k1 ': 'cai ', 'k2': 123} {'k2': 123}

#! /Usr/bin/env pythoni1 = {'k1 ': 'cai', 'k2 ': 123} for key, value in i1.items (): print (key, value) ================================================================= k1 caik2 123