PySparkPracticeQuestions PySpark練習題 practice1 from https://hackmd.io/Ob_0qtVnSBWSuaeD1UUOCA?view&fbclid=IwAR3ip-Kpcuzr1nLQ4dQXCZ8gVRxu9AZc_khwxLdRCXL6C6Vhgvk3Wzl_B_g#%E6%B8%AC%E8%A9%A6%E8%B3%87%E6%96%99testtxt%EF%BC%9A practice2 from https://blog.csdn.net/qq_43733123/article/details/105347995 practice3 from https://blog.csdn.net/qq_43733123/article/details/105372541