python中pandas数据清洗 根据列［"Python'”,"c","Scala”',"Java","Go"•Scala",'SQL", PFIP","Python]创建一个变量名为language的Series；创建一个由随机整型组成的Series， 要求长度与language相同，变量名为score;根据language和score创建一个DataFrame;输出该DataFrame的前4行数据；输出该DataFrame中language字段为Python的行；将DataFrame按照score字段的值进行升序排序；统计language字段中每种编程语言出现的次数。

可以按照以下步骤来实现：

1. 创建Series：language = pd.Series(["Python","c","Scala","Java","Go","Scala","SQL","PFIP","Python"])
2. 创建Series：score = pd.Series(np.random.randint(0, 100, len(language)))
3. 创建DataFrame：df = pd.DataFrame({'language': language, 'score': score})
4. 输出前4行数据：print(df.head(4))
5. 输出language字段为Python的行：print(df[df['language'] == 'Python'])
6. 按照score字段升序排序：df = df.sort_values('score', ascending=True)
7. 统计language字段中每种编程语言出现的次数：print(df['language'].value_counts())

完整代码如下：

import pandas as pd
import numpy as np

# 创建Series
language = pd.Series(["Python","c","Scala","Java","Go","Scala","SQL","PFIP","Python"])

# 创建Series
score = pd.Series(np.random.randint(0, 100, len(language)))

# 创建DataFrame
df = pd.DataFrame({'language': language, 'score': score})

# 输出前4行数据
print(df.head(4))

# 输出language字段为Python的行
print(df[df['language'] == 'Python'])

# 按照score字段升序排序
df = df.sort_values('score', ascending=True)

# 统计language字段中每种编程语言出现的次数
print(df['language'].value_counts())