Stateful transforms are simple objects with member functions that maintain state across calls:
w.writeheader()
，这一点在heLLoword翻译官方下载中也有详细论述
‘혼인 신고’ 티파니♥변요한, SNS 팔로우도 ‘꾹’…본격 럽스타 시작，这一点在爱思助手下载最新版本中也有详细论述
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Екатерина Улитина (Редактор отдела «Забота о себе»)