打印字典之間的formart間距

Question

我試圖從文件內的信息打印菜單，所以我拿走了信息並創建了一本字典。我試圖找出是否有方法來格式化值之間的間距，所以我可以將值與標頭對齊。我還試圖找出是否有任何關鍵字及其值將在中間沒有空格的情況下打印。 我的代碼目前看起來是這樣的：

#import classes 
import inventory 


#define constant for file 
INVENTORY = "inventory.txt" 

#define main 
def main(): 
    #create empty dictionary to fill later 
    inventory_dict = {} 
    #call function to process inventory 
    process_inventory(inventory_dict) 
    #call function to print menu 
    menu(inventory_dict) 


#define process file inventory function 
def process_inventory(inventory_dict): 

    #open inventory file 
    inventory_file = open(INVENTORY, 'r') 

    #create inventory instances 
    for item in inventory_file: 

     #split line to reash 
     inventory_list = item.split(",") 

     #create variables to store each quality 
     item_id = inventory_list[0] 
     item_name = inventory_list[1] 
     item_qty = inventory_list[2] 
     item_price = inventory_list[3] 

     #create object 
     product = inventory.Inventory(item_id,item_name,item_qty,item_price) 

     #add qualities to inventory dictionary 
     inventory_dict[item_id] = product 

    #close file 
    inventory_file.close() 

#define function to print menu 
def menu(inventory_dict): 
    #print headers 
    print("ID Item Price Qty Avaliable") 

    #print object information 
    for object_id in inventory_dict: 
     print(inventory_dict[object_id]) 

    #print how to exit 
    print("Enter 0 when finished") 

    #print blank line 
    print(" ") 

當打印輸出看起來像詞典：

Output

爲什麼會打印與價值線前兩個鍵行後沒有空間，但其他與之間的線？我想將每個值與它的標題對齊。那可能嗎？如果是這樣如何？我能想到的唯一方法就是使用打印功能並自己設置格式。

Answer 1

他們不對齊的原因是因爲每個項目是不同的長度。每行中的第一項將時間越長的下一個項目向右推。

這是你menu功能的修改版本，修復此：

def menu(inventory_dict): 
    maxLength = 0 
    for row in inventory_dict.values(): 
     for item in row.values(): 
      maxLength = max(len(item), maxLength) # If the item is longer than our current longest, make it the longest 
    #print headers 
    for header in ("ID", "Item", "Price", "Qty", "Avaliable"): 
     print(header.ljust(maxLength)) # Fill spaces in until the header is as long as our longest item 
    print() 

    #print object information 
    for row in inventory_dict.values(): 
     for item in row.values(): 
      print(item.ljust(maxLength)) # Fill spaces in until the header is as long as our longest item 

    #print how to exit 
    print("Enter 0 when finished") 

    #print blank line 
    print() 

我無法驗證，如果它的作品，因爲我沒有你inventory模塊雖然。