pyspark dataframe Column alias 重命名列(name) df = spark.createDataFrame( [(2, "Alice"), (5, "Bob")], ["age", "name"])df.select(df.age.alias("age2")).show()+---+|age2|+---+| 2|| 5|+---+ astype alias cast 修改列类型 data.schemaStructType([StructField('name', String...
values_1 = np.random.randint(10, size=10)values_2 = np.random.randint(10, size=10)years = np.arange(2010,2020)groups = ['A','A','B','A','B','B','C','A','C','C']df = pd.DataFrame({'group':groups, 'year':years, 'value_1':values_1, 'value_2':values_2})df 1...
但是,在我将变量arrayData中的文本“name2”更改为“name”并在df3中引用它之后,如下所示, df3 = df.select(df.resource.id, df.resource.name) 我犯了以下错误 TypeError: Invalid argument, not a string or column: <bound method alias of Column> of type <class 'method'>. For column literals, ...
DataFrame(columns=['idx', 'name']) for attr in temp['numeric']: temp_df = {} temp_df['idx'] = attr['idx'] temp_df['name'] = attr['name'] #print(temp_df) df_importance = df_importance.append(temp_df, ignore_index=True) #print(attr['idx'], attr['name']) #print(attr)...
spark dataframe是immutable, 因此每次返回的都是一个新的dataframe (1)列操作 # add a new column data = data.withColumn("newCol",df.oldCol+1) # replace the old column data = data.withColumn("oldCol",newCol) # rename the column data.withColumnRenamed("oldName","newName") # change column ...
df = spark.createDataFrame([{'name':'Alice','age':1}, {'name':'Polo','age':1}]) 4.指定schema创建DataFrame schema = StructType([ StructField("id", LongType(), True), StructField("name", StringType(), True), StructField("age", LongType(), True), StructField("eyeColor", Stri...
PySpark Replace Column Values in DataFrame Pyspark 字段|列数据[正则]替换 转载:[Reprint]:https://sparkbyexamples.com/pyspark/pyspark-replace-column-values/#:~:text=By using PySpark SQL function regexp_replace () you,value with Road string on address column. 2. ...
PysparkNote102---DataFrame常用操作2 1 重复数据筛查 满足以下功能: 筛选出重复的行。 对某一个字段,筛选出重复的值 对某几个字段筛选出重复的值 1.1 重复行 frompyspark.sqlimportSparkSession # 创建SparkSession对象,调用.builder类 # .appName("testapp")方法给应用程序一个名字;.getOrCreate()...
1) Spark DataFrame的转换 代码语言:txt AI代码解释 from pyspark.sql.types import MapType, StructType, ArrayType, StructField from pyspark.sql.functions import to_json, from_json def is_complex_dtype(dtype): """Check if dtype is a complex type ...
DataFrame column operations 对数据框列的操作 筛选操作 # Show the distinct VOTER_NAME entries voter_df.select(voter_df['VOTER_NAME']).distinct().show(40, truncate=False) 去除重复值 # Filter voter_df where the VOTER_NAME is 1-20 characters in length voter_df = voter_df.filter('length(VOT...