python编程快速上手 6.7实践项目 表格打印

#请问在程序最后加上print(" ") 为啥能分成三行，不加的话是一整行！

tableData = [['apple','orange','cherry','banana'],
             ['Alice','Bob','Cathy','David'],
             ['dog','cat','bird','duck']]

colWidth = [0] * len(tableData)
#print(str(len(colWidth)))
for i in range(len(colWidth)):
    com = 0
    for k in range(len(tableData[0])):
        if len(tableData[i][k]) > com:
            com = len(tableData[i][k])
    colWidth[i] = com

for i in range(len(tableData[0])):
    for k in range(len(colWidth)):
        print(tableData[k][i].rjust(colWidth[k]),end=' ')
    print('')

#程序运行结果
 ‘’‘’ apples Alice  dogs     
 oranges   Bob   cat     
cherries Carol moose     
  banana David goose ‘’‘’

print('')默认为换行控制，所以不加内容的话，会自动换行

因为print自带换行