python pandas 使用例子

# coding = gbk
import pandas as pd
csv_data = pd.read_csv("tourist_statistic.csv", low_memory = False)#防止弹出警告
csv_df = pd.DataFrame(csv_data)

print(csv_df)

avg=[]#待增加的列的内容

for index,row in csv_df.iterrows():
    total=0.0
    for i in range(2,len(row)):
        total+=float(row[i])
    total=round(total/10,4)
    avg.append(total)

print(avg)
csv_df['平均入境游客(万人次)']=avg
csv_df.to_csv("tourist_statistic.csv",index=False)
print(csv_df)

# 输出人次
for index,row in csv_df.iterrows():
    if(row[0]=="亚洲" and row[11]>180):
        print(row[1][:-4])

print(csv_df.iloc[19][11]-csv_df.iloc[19][2])

#排序
b=csv_df.sort_values(by="2018年" , ascending=True)
print(b)