loop dictionary
A dictionary is a key-value pair. Beginners may not be used to how to loop a dictionary:
Method 1: Cycle key
scores = {
'zhangsan':98, 'lisi':89, 'maishu':96}
for name in scores:
print(f'{name}:{scores[name]}')
- By default, the loop dictionary is actually the keys of the loop dictionary, so the name is a key.
- If you need to access the value, you can access it through scores[name ].
Results of the:
zhangsan:98
lisi:89
maishu:96
[Finished in 15ms]
Because the default cycle is keys, the following code is exactly the same principle as above:
for name in scores.keys():
print(f'{name}:{scores[name]}')
We call the scores.keys() method to get a list of keys, and then loop over it. This is the same effect as above.
Method 2: Loop key and value
If you want to access key and value more conveniently, you can write like this:
for name, score in scores.items():
print(f'{name}:{score}')
Through the items() function, the dictionary is converted into a list of ( key, value ) tuples, so that the key and value can be accessed directly.
In order to be more intuitive in the code, we use name and score to represent key and value.
Note that Python's automatic package opening function is also used here to automatically turn the tuple into two variables.
Method 3: Print the serial number
If you want to print the serial number in addition to the key and value. The desired result is something like this:
0 zhangsan 98
1 lisi 89
2 maishu 96
You can use the enumerate function, the code is as follows:
scores = {
'zhangsan':98, 'lisi':89, 'maishu':96}
for i, (name, score) in enumerate(scores.items()):
print(i, name, score)
First use the items() function to convert it into a list of tuples, and then use the enumerate function to add the serial number.
Note that because it is a tuple, parentheses must be added to the variable of for: i, (name, score ). Python can only do simple automatic package opening. There is also a variable i , which will not automatically open the package. It is just a single variable tuple and needs to be added with parentheses.
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