python如何取动态变量名的值？

• Z时代
• 2024-02-13
• 分类：IT

程序结构大体如下

tree_1={...}
tree_2={...}
...
tree_n={...}

如何通过for循环取出以上变量，并遍历
for i in range(1,n):

for item in tree_i:  关键是这个tree_i如何搞

回答：

python">tree_1 = {'a1': 1, 'a2': 2}
tree_2 = {'a3': 3, 'a4': 4}
tree_3 = {'a5': 5, 'a6': 6}
for i in range(1, 4):
    value = eval(f'tree_{i}')
    for item in value:
        print(item, value[item])

或者

tree_1 = {'a1': 1, 'a2': 2}
tree_2 = {'a3': 3, 'a4': 4}
tree_3 = {'a5': 5, 'a6': 6}
for i in range(1, 4):
    value = locals()[f'tree_{i}']
    for item in value:
        print(item, value[item])

回答：

推荐方法1：

trees = {
    'tree_1': {...},
    'tree_2': {...},
    # ...
    'tree_n': {...},
}
for i in range(1, n+1):
    tree = trees[f'tree_{i}']
    for item in tree:
        # 

方法二三：

for i in range(1, n+1):
    tree = locals()[f'tree_{i}']
    for item in tree:

或者

for i in range(1, n+1):
    tree = globals()[f'tree_{i}']
    for item in tree:

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