Python学习-表格打印字符串列表

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题目：
编写一个名为 printTable()的函数，它接受字符串的列表的列表，将它显示在组
织良好的表格中，每列右对齐。假定所有内层列表都包含同样数目的字符串。例如，
该值可能看起来像这样：

---

tableData = [['apples', 'oranges', 'cherries', 'banana'],
	         ['Alice', 'Bob', 'Carol', 'David'],
	         ['dogs', 'cats', 'moose', 'goose']]

---

你的 printTable()函数将打印出：

---

    apples    Alice      dog
   oranges      Bob     cats
  cherries    Carol    moose
    banana    David    goose

---

# 获取一维列表中字符串法的最大长度
def maxlen(tableData):
    num = 0
    for i in range(len(tableData)):
        if num < len(tableData[i]):
            num = len(tableData[i])

    # 返回列表中最长的字符串的长度
    return num

# 二位列表将列表以行格式化打印
#       apples     oranges    cherries      banana
#        Alice         Bob       Carol       David
#         dogs        cats       moose       goose
def printRowTable(tableData,flag):

    colWidths = [0] * len(tableData)
    for i in range(len(tableData)):
        colWidths[i] = maxlen(tableData[i])
    num = max(colWidths)

    for i in range(len(tableData)):
        for j in range(len(tableData[i])):
            if flag == 'left' :
                print(tableData[i][j].ljust(num + 4), end="")
            elif flag == 'right':
                print(tableData[i][j].rjust(num + 4), end="")
            else:
                print(tableData[i][j].center(num + 4), end="")
        print()

# 二位列表将列表以列格式化打印
#     apples    Alice      dog
#    oranges      Bob     cats
#   cherries    Carol    moose
#     banana    David    goose
def printColumnTable(tableData,flag):

    colWidths = [0] * len(tableData)
    for i in range(len(tableData)):
        colWidths[i] = maxlen(tableData[i])
    num = max(colWidths)

    for j in range(len(tableData[0])):
        for i in range(len(tableData)):
            if flag == 'left' :
                print(tableData[i][j].ljust(num + 4), end="")
            elif flag == 'right':
                print(tableData[i][j].rjust(num + 4), end="")
            else:
                print(tableData[i][j].center(num + 4), end="")
        print()

tableData = [['apples', 'oranges', 'cherries', 'banana'],
             ['Alice', 'Bob', 'Carol', 'David'],
             ['dogs', 'cats', 'moose', 'goose']]

print("======================Row===========================")
printRowTable(tableData,'right')
print("====================================================")
printRowTable(tableData,'left')
print("====================================================")
printRowTable(tableData,'center')
print("======================Column========================")
printColumnTable(tableData,'right')
print("====================================================")
printColumnTable(tableData,'left')
print("====================================================")
printColumnTable(tableData,'center')

运行结果:

======================Row===========================
      apples     oranges    cherries      banana
       Alice         Bob       Carol       David
        dogs        cats       moose       goose
====================================================
apples      oranges     cherries    banana      
Alice       Bob         Carol       David       
dogs        cats        moose       goose       
====================================================
   apples     oranges     cherries     banana   
   Alice        Bob        Carol       David    
    dogs        cats       moose       goose    
======================Column========================
      apples       Alice        dogs
     oranges         Bob        cats
    cherries       Carol       moose
      banana       David       goose
====================================================
apples      Alice       dogs        
oranges     Bob         cats        
cherries    Carol       moose       
banana      David       goose       
====================================================
   apples      Alice        dogs    
  oranges       Bob         cats    
  cherries     Carol       moose    
   banana      David       goose