You can also replace column values from thepython dictionary (map). In the below example, we replace the string value of thestatecolumn with the full abbreviated name from a dictionarykey-value pair, in order to do so I usePySpark map() transformation to loop through each row of DataFrame....
CodeInText:指示文本中的代码词、数据库表名、文件夹名、文件名、文件扩展名、路径名、虚拟 URL、用户输入和 Twitter 句柄。以下是一个例子:“将下载的WebStorm-10*.dmg磁盘映像文件挂载为系统中的另一个磁盘。” 代码块设置如下: test("Should use immutable DF API") {importspark.sqlContext.implicits._ /...
AI代码解释 train.orderBy(train.Purchase.desc()).show(5)Output:+---+---+---+---+---+---+---+---+---+---+---+---+|User_ID|Product_ID|Gender|Age|Occupation|City_Category|Stay_In_Current_City_Years|Marital_Status|Product_Category_1|Product_Category_2|Product_Category_3|Purch...
1、 agg(expers:column*) 返回dataframe类型 ,同数学计算求值 df.agg(max("age"), avg("salary")) df.groupBy().agg(max("age"), avg("salary")) 2、 agg(exprs: Map[String, String]) 返回dataframe类型 ,同数学计算求值 map类型的 df.agg(Map("age" -> "max", "salary" -> "avg")) df....
format(column_name)) -- Example with the column types for column_name, column_type in dataset.dtypes: -- Replace all columns values by "Test" dataset = dataset.withColumn(column_name, F.lit("Test")) 12. Iteration Dictionaries # Define a dictionary my_dictionary = { "dog": "Alice",...
when(condition, value1).otherwise(value2),意为:当满足条件condition的值时赋值为values1,不满足条件的则赋值为values2,otherwise表示,不满足条件的情况下,应该赋值何值。 例: AI检测代码解析 from pyspark.sql import functions as F df.select(df.customerID,F.when(df.gender=="Male","1").when(df.gend...
To replace strings with other values, use the replace method. In the example below, any empty address strings are replaced with the word UNKNOWN:Python Копирај df_customer_phone_filled = df_customer.na.replace([""], ["UNKNOWN"], subset=["c_phone"]) Append rows...
let’s initiate “emp” and “dept” DataFrames.The emp DataFrame contains the “emp_id” column with unique values, while the dept DataFrame contains the “dept_id” column with unique values. Additionally, the “emp_dept_id” from “emp” refers to the “dept_id” in the “dept” da...
25. regexp_extract，regex_replace字符串处理 26.round 四舍五入函数 27.split对固定模式的字符串进行...
# filter(condition:Column):通过给定条件过滤行。 # count():返回DataFrame行数。 numInstances = int(numChange0/10000)*10000 train = data.filter(data.is_acct_aft==1).sample(False,numInstances/numChange1+0.001).limit(numInstances).unionAll(data.filter(data.is_acct_aft==0).sample(False, 1.0...