date_this_month 类型打印错误

[bochuan122]

C:\Users\87293\Desktop\datafaker
λ datafaker file ./ t_date 5 --meta t_date.txt --outprint

sequence item 0: expected str instance, datetime.date found
sequence item 0: expected str instance, datetime.date found
sequence item 0: expected str instance, datetime.date found
sequence item 0: expected str instance, datetime.date found
sequence item 0: expected str instance, datetime.date found
time used: 0.130 s

C:\Users\87293\Desktop\datafaker
λ cat t_date.txt
c_date || date || 当前月份[:date_this_month]
C:\Users\87293\Desktop\datafaker
λ cat t_date
2020-06-03
2020-06-08
2020-06-13
2020-06-06
2020-06-05

[gangly]

C:\Users\87293\Desktop\datafaker
λ datafaker file ./ t_date 5 --meta t_date.txt --outprint

sequence item 0: expected str instance, datetime.date found
sequence item 0: expected str instance, datetime.date found
sequence item 0: expected str instance, datetime.date found
sequence item 0: expected str instance, datetime.date found
sequence item 0: expected str instance, datetime.date found
time used: 0.130 s

C:\Users\87293\Desktop\datafaker
λ cat t_date.txt
c_date || date || 当前月份[:date_this_month]
C:\Users\87293\Desktop\datafaker
λ cat t_date
2020-06-03
2020-06-08
2020-06-13
2020-06-06
2020-06-05

date_this_month标记是产生这个月内的日期，请仔细查看文档

[bochuan122]

抱歉，可能描述的不太清楚，标记产生当前月份的日期这点没理解错误。我是想确认使用屏幕打印命令参数时，输出类型与预期不符的原因。
sequence item 0: expected str instance, datetime.date found