python3读取csv文件任意行列代码实例

#读取每一行
filename='D:\\file_information1.csv'
import csv

with open(filename,newline = '',encoding = 'utf-8') as f:   #参数encoding = 'utf-8'防止出现乱码
  reader = csv.reader(f)   #使用csv的reader()方法，创建一个reader对象 csv.reader（）读取结果是列表
  for row in reader: #遍历reader对象的每一行
    print(row)

file1 = open('D:\\new\\abc.txt','a',encoding='utf-8')
file1.write('张无忌\n')
file1.write('宋青书\n')
file1.close()

seasons = ['Spring', 'Summer', 'Fall', 'Winter']
print(list(enumerate(seasons)))       # [(0, 'Spring'), (1, 'Summer'), (2, 'Fall'), (3, 'Winter')]
print(list(enumerate(seasons, start=1)) ) # [(1, 'Spring'), (2, 'Summer'), (3, 'Fall'), (4, 'Winter')]

# 普通for循环：
i = 0
seq = ['one', 'two', 'three']
for element in seq:
  print( i, seq[i])
  i +=1
'''
one
two
three
'''
# for 循环使用 enumerate
seq1 = ['one', 'two', 'three']
for j, element in enumerate(seq1):
  print (j, element)
'''
one
two
three
'''

import chardet
def get_file_code(file_path):
  with open(file_path, 'rb') as f:
    data = f.read()
    print('获取到的CSV文件编码为：%s' % (chardet.detect(data)['encoding']))
    return chardet.detect(data)['encoding']

file_path = r'D:\\file_information1.csv'
get_file_code(file_path)

f = open("D:\\file_information1.csv","rb")#二进制格式读文件
i = 0
while True:
  print(i)
  line = f.readline()
  if not line:
    break
  else:
    try:
#       print(line)
#       print(line.decode('utf8'))
      line.decode('utf8')
      #为了暴露出错误，最好此处不print
    except:
      print(str(line))
  i += 1

filename='D:\\file_information1.csv'
with open(filename,'r',encoding='utf-8')as f: #自行先判断文件的编码方式
  read=f.readlines()
  for index,info in enumerate(read):
    if index ==0:  #这里判断
      #这里输出的是字符串类型
      print(info)

filename='D:\\file_information1.csv'
with open(filename,'r',encoding='utf-8')as f:
  read=f.readlines()
  for index,info in enumerate(read):
    if index !=0:  #这里判断
      print(info)

filename='D:\\file_information1.csv'
with open(filename,'r',encoding='utf-8')as f:
  read=f.readlines()
  for index,info in enumerate(read):
    if index <10: #这里为索引，是 int 整形
      print(index,info)

import csv
filename='D:\\file_information1.csv'
with open(filename,'r',encoding='utf-8')as f:
  read=f.readlines()
  for index,info in enumerate(read):
    print(index) #自己根据index的数字判断

import csv
filename='D:\\file_information1.csv'
with open(filename,'r',encoding='utf-8')as f:
  read=csv.reader(f)
  for index,info in enumerate(read):
      #这里输出的是列表类型
      print(info[:2])  #[:2]代表的是读取第0列和第1列 ，第2列不包括

import csv
filename='D:\\file_information1.csv'
with open(filename,'r',encoding='utf-8')as f:
  read=csv.reader(f)
  for index,info in enumerate(read):
    if index!=0:  #这里加判断
      print(info[:2])

import csv
filename='D:\\file_information1.csv'
with open(filename,'r',encoding='utf-8')as f:
  read=csv.reader(f)
  for index,info in enumerate(read):
      print(info[-2:])

filename='D:\\file_information1.csv'
with open(filename,'r',encoding='utf-8')as f:
  read=csv.reader(f)
  for index,info in enumerate(read):
    if index==0:
      print(info[2:3])