enumerate() 函式用於將乙個可遍歷的資料物件(如列表、元組或字串)組合為乙個索引序列,同時列出資料和資料下標
filename='d:/data.csv'
with open(filename,'r',encoding='utf-8')as f:
read=f.readlines()
for index,info in enumerate(read):
if index ==0: #這裡判斷
#這裡輸出的是字串型別
print(info)
filename='data.csv'
with open(filename,'r',encoding='utf-8')as f:
read=f.readlines()
for index,info in enumerate(read):
if index !=0: #這裡判斷
print(info)
filename='data.csv'
with open(filename,'r',encoding='utf-8')as f:
read=f.readlines()
for index,info in enumerate(read):
if index <10: #這裡為索引,是 int 整形
print(info)
filename='data.csv'
with open(filename,'r',encoding='utf-8')as f:
read=f.readlines()
for index,info in enumerate(read):
print(index) #自己根據index的數字判斷
import csv
filename='data.csv'
with open(filename,'r',encoding='utf-8')as f:
read=csv.reader(f)
for index,info in enumerate(read):
#這裡輸出的是列表型別
print(info[:2]) #[:2]代表的是讀取第0列和第1列 ,第2列不包括
import csv
filename='data.csv'
with open(filename,'r',encoding='utf-8')as f:
read=csv.reader(f)
for index,info in enumerate(read):
if index!=0: #這裡加判斷
print(info[:2])
import csv
filename='data.csv'
with open(filename,'r',encoding='utf-8')as f:
read=csv.reader(f)
for index,info in enumerate(read):
print(info[-2:])
filename='data.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])
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