Use of dictionaries and collections in Python

1. Use of dictionaries

# 1. Define a dictionary that uses a, B, C, D as the dictionary's keywords, with values of any content Dict1= {' A‘:' AA‘,' B‘: ' Xyz " c< Span class= "Pl-pds" > ':  ' Helo "< Span class= "Pl-pds" > ' D ': 123}# 2. After adding an element ' C ': ' Cake ' to the dictionary, output the dictionary to the screen # the key of the dictionary cannot be duplicated, otherwise the value of the same key will be overwritten dict1[  ' C "=  ' Cake print (dict1)  # 3. Remove the value of the keyword D in the dictionary print (Dict1[ d< Span class= "Pl-pds") 
              
2. Use of the collection

The elements in the ' Hello ' # collection cannot repeat print (set (STR1))   

Use of dictionaries and collections in Python