什么 python 代码允许我从以字母开头的列表中打印出元素？

Question

示例：我创建了一个名为月份的列表。我如何编写一个循环遍历月份的元素并打印出每个以字母“J”开头的元素，每行一个月。

Answer 1

在 python 中，您可以使用 for 循环遍历列表。然后，您可以使用条件语句来检查月份是否以“J”开头。例子：

months = ['January', 'February', 'March' 'June', 'October']

for month in months:

    if month[0] == 'J':

        print(month)

这导致

January

June

Answer 2

如果您正在寻找如何根据元素的首字母过滤元素

months=["January","February","March","April","May","June","July","August","September","October","November","December"]

for m in months:

    if m.startswith('J'):

        print m

January

June

July

Answer 3

遍历每个元素，看看它是否是一个字符串。如果是，则检查第一个元素。

yourList = ["January"]

checkLetter = "J"

for element in yourList:

    if isinstance(element,str):

        if element[0]== checkLetter:

            print(element)