如何对齐Python二维列表输出，让股票投资组合打印排版整齐？

方法1：手动指定列宽格式化（无需额外依赖） #

通过Python字符串格式化语法为每一列固定显示宽度，文本类字段左对齐、数值类字段右对齐，即可保证排版整齐，适配学校项目这类需求固定的场景：

listofstock=[]
listofstock.append(["No","Company","Cap","Qty","BoughtPrice","MarketPrice"])
listofstock.append([1,"Microsoft","Mega",100,188,207])
listofstock.append([2,"Amazon","Mega",5,1700,3003])
listofstock.append([3,"PayPal","Large",80,100,188])
listofstock.append([4,"Apple","Large",100,60,110])
listofstock.append([5,"Fastly","Mid",30,40,76])
listofstock.append([6,"Square","Mid",30,40,178])

# 按列顺序定义每列的显示宽度
col_widths = [3, 12, 6, 5, 12, 13]
for row in listofstock:
    # 前3列为文本类，左对齐；后3列为数值类，右对齐更易读
    print(f"{row[0]:<{col_widths[0]}}"
          f"{row[1]:<{col_widths[1]}}"
          f"{row[2]:<{col_widths[2]}}"
          f"{row[3]:>{col_widths[3]}}"
          f"{row[4]:>{col_widths[4]}}"
          f"{row[5]:>{col_widths[5]}}")

输出效果如下：

No Company      Cap      Qty  BoughtPrice  MarketPrice
1  Microsoft    Mega     100          188          207
2  Amazon       Mega       5         1700         3003
3  PayPal       Large     80          100          188
4  Apple        Large    100           60          110
5  Fastly       Mid       30           40           76
6  Square       Mid       30           40          178

方法2：自动计算列宽（适配动态数据） #

如果后续可能新增不同长度的公司名称等动态数据，可以先遍历所有内容计算每列的最大宽度，再做格式化，无需手动调整宽度值：

listofstock=[]
listofstock.append(["No","Company","Cap","Qty","BoughtPrice","MarketPrice"])
listofstock.append([1,"Microsoft","Mega",100,188,207])
listofstock.append([2,"Amazon","Mega",5,1700,3003])
listofstock.append([3,"PayPal","Large",80,100,188])
listofstock.append([4,"Apple","Large",100,60,110])
listofstock.append([5,"Fastly","Mid",30,40,76])
listofstock.append([6,"Square","Mid",30,40,178])

# 自动计算每列的最大宽度
col_widths = [0]*len(listofstock[0])
for row in listofstock:
    for idx, col in enumerate(row):
        col_widths[idx] = max(col_widths[idx], len(str(col)))

for row in listofstock:
    for idx, col in enumerate(row):
        if isinstance(col, str):
            print(f"{col:<{col_widths[idx]}}  ", end="")
        else:
            print(f"{col:>{col_widths[idx]}}  ", end="")
    print()

方法3：使用第三方库快速实现（适合开发效率优先场景） #

如果允许引入第三方依赖，tabulate库可以直接把二维列表转换为对齐的文本表格，无需自己写格式化逻辑：

1. 安装依赖：pip install tabulate
2. 代码实现：

from tabulate import tabulate

listofstock=[]
listofstock.append(["No","Company","Cap","Qty","BoughtPrice","MarketPrice"])
listofstock.append([1,"Microsoft","Mega",100,188,207])
listofstock.append([2,"Amazon","Mega",5,1700,3003])
listofstock.append([3,"PayPal","Large",80,100,188])
listofstock.append([4,"Apple","Large",100,60,110])
listofstock.append([5,"Fastly","Mid",30,40,76])
listofstock.append([6,"Square","Mid",30,40,178])

print(tabulate(listofstock[1:], headers=listofstock[0], tablefmt="simple"))

内容的提问来源于stack exchange，提问作者RpNeverKeel