Question

我有一个像这样的python字典：

# cellset is the dictionary
for x in cellset:
    x.replace('Live','Live1')

取代＆＃39; Live＆＃39;的最佳方式是什么？字符串＆＃39; Live2＆＃39;对于字典中的所有键？

我已经尝试了以下但是它抛出了一个错误：

pq = []                         # list of entries arranged in a heap
entry_finder = {}               # mapping of tasks to entries
REMOVED = '<removed-task>'      # placeholder for a removed task
counter = itertools.count()     # unique sequence count

def add_task(task, priority=0):
    'Add a new task or update the priority of an existing task'
    if task in entry_finder:
        remove_task(task)
    count = next(counter)
    entry = [priority, count, task]
    entry_finder[task] = entry
    heappush(pq, entry)

def remove_task(task):
    'Mark an existing task as REMOVED.  Raise KeyError if not found.'
    entry = entry_finder.pop(task)
    entry[-1] = REMOVED

def pop_task():
    'Remove and return the lowest priority task. Raise KeyError if empty.'
    while pq:
        priority, count, task = heappop(pq)
        if task is not REMOVED:
            del entry_finder[task]
            return task
    raise KeyError('pop from an empty priority queue'

AttributeError：＆＃39; tuple＆＃39;对象没有属性＆＃39;替换＆＃39;

Answer 1

d = {
    ('Live', '2017-Jan', '103400000', 'Amount'): 30, 
    ('Live', '2017-Feb', '103400000', 'Amount'): 31, 
    ('Live', '2017-Mar', '103400000', 'Amount'): 32,
    ('Live', '2017-Jan', '103401000', 'Amount'): 34
}

new_d = {}

for k, v in d.items():
    new_key = tuple('Live1' if el == 'Live' else el for el in k)
    new_d[new_key] = v

print(new_d)

# Output:
# {('Live1', '2017-Jan', '103400000', 'Amount'): 30, ('Live1', '2017-Feb', '103400000', 'Amount'): 31, ('Live1', '2017-Mar', '103400000', 'Amount'): 32, ('Live1', '2017-Jan', '103401000', 'Amount'): 34}

Answer 2

其他人向您展示了如何使用'Live1'替换'Live'来创建新词典。如果您希望在原始字典中进行这些替换，可能的解决方案将类似于此

for (head, *rest), v in tuple(d.items()):
    if head == "Live":
        d[("Live1", *rest)] = v
        del d[(head, *rest)]

Python：替换字典键中字符串的最佳方法是什么

2 个答案: