python怎么读csv文件

with open("fileName.csv") as file: 
 for line in file: 
 print line

import csv
csv_reader = csv.reader(open("fileName.csv"))
for row in csv_reader: 
 print row

import pandas as pd
data = pd.read_csv("fileName.csv")
print data
data = pd.read_table("fileName.csv",sep=",")
print data