for回圈中的Python意外輸出

我有一個帶有配置的 JSON 檔案， schedules.json其中包含有關模式和一對用戶的資訊，例如：

{
    "pattern": [
        [2, "john", "jane"],
        [2, "sam", "bob"],
        [3, "john", "jane"],
        [2, "sam", "bob"],
        [2, "john", "jane"],
        [3, "sam", "bob"]
    ]
}

這個想法是，對于在第一個索引中找到的數字，將為該串列中的每個用戶創建一個 json 物件，用于在該數字中找到的次數。即：
對于一個模式[2,"john","jane"]，一個 json 物件，john每個jane將被創建 2 次。
對于一個模式[3,"john","jane"]，一個 json 物件，john每個jane將被創建 3 次，等等......

python代碼如下：

shift_rota = []

schedule_layers_template = {
    "morning_user": "",
    "night_user": ""
}

# Load the schedules config file
with open('config/schedules.json') as f:
    
    schedules = json.load(f)
    
    for pattern in schedules['pattern']:
                    
        # Get the number of occurrences
        occurence = int(pattern[0])
        
        # Remove occurence from list
        pattern.pop(0)
        
        morning_shift_user = pattern[0]
        night_shift_user = pattern[1]
        
        for _ in range(0, occurence):
            
            my_template = schedule_layers_template
        
            my_template['morning_user'] = morning_shift_user
            
            # Append schedule layer to list
            shift_rota.append(my_template)
        
            my_template['night_user'] = night_shift_user
            
            # Append schedule layer to list
            shift_rota.append(my_template)
            
print(f"Final shift rota {shift_rota}")

這里的問題是最終輸出回傳這個：

Final shift rota [{'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}, {'morning_user': 'sam', 'night_user': 'bob'}]

由于某些原因，最終輸出是重復用戶 sam 和 bob。有人可以幫忙嗎？

uj5u.com熱心網友回復：

PFB 修改后的代碼運行良好。

在這里，我們應該創建一個 schedule_layers_template 的副本，然后將其分配給 my_template。

import json


shift_rota = []
schedule_layers_template = {
    "morning_user": "",
    "night_user": ""
}
# Load the schedules config file
with open('schedules.json') as f:
    schedules = json.load(f)
    for pattern in schedules['pattern']:
        # Get the number of occurrences
        occurence = int(pattern[0])
        # Remove occurence from list
        pattern.pop(0)
        morning_shift_user = pattern[0]
        night_shift_user = pattern[1]
        for _ in range(0, occurence):
            my_template = schedule_layers_template.copy()
            my_template['morning_user'] = morning_shift_user
            my_template['night_user'] = night_shift_user
            # Append schedule layer to list
            shift_rota.append(my_template)
print(f"Final shift rota {shift_rota}")

uj5u.com熱心網友回復：

我能夠通過使用來修復它deepcopy。下面的示例代碼：

import copy

...

with open('schedules.json') as f:
schedules = json.load(f)
for pattern in schedules['pattern']:
    # Get the number of occurrences
    occurence = int(pattern[0])
    # Remove occurence from list
    pattern.pop(0)
    morning_shift_user = pattern[0]
    night_shift_user = pattern[1]
    for _ in range(0, occurence):
        my_template = copy.deepcopy(schedule_layers_template)
        my_template['morning_user'] = morning_shift_user
        my_template['night_user'] = night_shift_user
        # Append schedule layer to list
        shift_rota.append(my_template)
print(f"Final shift rota {shift_rota}")

uj5u.com熱心網友回復：

為了避免必須復制的問題，將模板移動到 for 回圈中并運行會更容易

shift_rota = []
with open('schedules.json') as f:
    
    schedules = json.load(f)
    
    for pattern in schedules['pattern']:
        
        # Get the number of occurrences
        occurence = int(pattern[0])
        
        for _ in range(0,occurence):
            
            schedule_layers_template = {
                "morning_user": pattern[1],
                "night_user": pattern[2]
            }
            shift_rota.append(schedule_layers_template)
        
            
            
pprint(shift_rota)

標籤：Python python-3.x for循环

上一篇：Scapy中的Sendp函式

下一篇：大熊貓中兩個日期之間的每小時值總和