https://spark.apache.org/docs/3.1.1/api/python/reference/api/pyspark.sql.functions.substring.htm...
import findspark findspark.init() import os import sys spark_name = os.environ.get('SPARK_HOME',None) if not spark_name: raise ValueErrorError('spark环境没有配置好') sys.path.insert(0,os.path.join(spark_name,'python')) sys.path.insert(0,os.path.join(spark_name,'D:\spark-3.0.0-p...
使用日期过滤日志文件的方法方法一:使用grep命令和日期模式grep命令是一种强大的文本搜索工具,它可以用于在文件中查找匹配的文本行。...方法二:使用find命令和-newermt选项find命令用于在文件系统中搜索文件和目录。它可以使用-newermt选项来查找在指定日期之后修改过的文件。...以下是使用journalctl命令根据日期过滤日志的...
from pyspark.sql.functions import format_string df = spark.createDataFrame([(5, "hello")], ['a', 'b']) df.select(format_string('%d %s', df.a, df.b).alias('v')).withColumnRenamed("v","vv").show() 4.查找字符串的位置 from pyspark.sql.functions import instr df = spark.createD...
Filter a Dataframe based on a custom substring search from pyspark.sql.functions import col df = auto_df.where(col("carname").like("%custom%")) # Code snippet result: +---+---+---+---+---+---+---+---+---+ | mpg|cylinders|displacement|horsepower|weight|acceleration|modelyear|...
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Filter a Dataframe based on a custom substring search from pyspark.sql.functions import col df = auto_df.where(col("carname").like("%custom%")) # Code snippet result: +---+---+---+---+---+---+---+---+---+ | mpg|cylinders|displacement|horsepower|weight|acceleration|modelyear|...
String Functions # Substring - col.substr(startPos, length)df=df.withColumn('short_id',df.id.substr(0,10))# Trim - F.trim(col)df=df.withColumn('name',F.trim(df.name))# Left Pad - F.lpad(col, len, pad)# Right Pad - F.rpad(col, len, pad)df=df.withColumn('id',F.lpad('id...
from pyspark.sql.functions import substring df = spark.createDataFrame([('abcd',)], ['s']) df.select(substring(df.s, 1, 2).alias('s')).show() #1与2表示开始与截取长度 6.正则表达式替换 from pyspark.sql.functions import regexp_replace ...