[英]read specific data in CSV
我編寫了一個代碼,該代碼讀取作為輸入的產品並給出產品價格的輸出
data.csv文件
1, 4.00, teddy_bear
1, 8.00, baby_powder
2, 5.00, teddy_bear
2, 6.50, baby_powder
3, 4.00, pampers_diapers
3, 8.00, johnson_wipes
4, 5.00, johnson_wipes
4, 2.50, cotton_buds
5, 4.00, bath_towel
5, 8.00, scissor
6, 5.00, scissor
6, 6.00, bath_towel, cotton_balls, powder_puff
python代碼
import csv
with open('data.csv') as csvfile:
readCSV = csv.reader(csvfile, delimiter=',')
usrid = []
price = []
product = []
for row in readCSV:
usrid.append(row[0])
price.append(row[1])
product.append(row[2])
askProduct = raw_input('What Product do you wish to know the price of?:')
abc = product.index(askProduct)
thePrice = price[abc]
print ('the price of product',askProduct, 'is', thePrice)
產生錯誤
Traceback (most recent call last):
File "C:/Users/Desktop/program.py", line 15, in <module>
abc = product.index(askProduct)
ValueError: 'teddy_bear' is not in list
需要以下輸出
Program Input
program data.csv teddy_bear baby_powder
Expected Output
=> 2(userid), 11.5(addition of two products)
CSV中有多余的空間,因此您的產品實際上是" teddy_bear"
。 Python的csv.reader()
允許您使用skipinitialspace
參數告訴它忽略分隔符周圍的多余空格:
csv.reader(csvfile, delimiter=',', skipinitialspace=True)
您需要刪除行中每個單元格之前的空間。 由於定界符為',',並且您的數據文件在每個“,”之后都有一個空格
import csv
with open('data.csv') as csvfile:
readCSV = csv.reader(csvfile, delimiter=',')
usrid = []
price = []
product = []
for row in readCSV:
usrid.append(row[0].strip())
price.append(row[1].strip())
product.append(row[2].strip())
askProduct = raw_input('What Product do you wish to know the price of?:')
abc = product.index(askProduct)
thePrice = price[abc]
print ('the price of product',askProduct, 'is', thePrice)
我會檢查一下清單的組成方式,由於CSV的構造方式,您的產品數組很有可能像[' teddy_bear', ' baby_powder']
等。 解決此問題的一種方法是嘗試
usrid.append(row[0].strip())
添加時應該刪除空格
您的代碼不僅失敗,而且失敗了,您還錯過了逗號分隔的最后一個產品。 這是我的建議
import csv
with open('data.csv') as csvfile:
readCSV = csv.reader(csvfile, delimiter=',')
usrid = []
price = []
product = []
for row in readCSV:
# tmp_products = row[2].split().strip()
for the_product in row[2::]:
usrid.append(row[0])
price.append(row[1])
product.append(the_product.strip())
askProduct = raw_input('What Product do you wish to know the price of?: ')
abc = product.index(askProduct)
thePrice = price[abc]
print ('the price of product',askProduct, 'is', thePrice)
而且,您擁有價格不同的同一產品,因此代碼可能類似於:
import csv
with open('data.csv') as csvfile:
readCSV = csv.reader(csvfile, delimiter=',')
usrid = []
price = []
product = []
for row in readCSV:
# tmp_products = row[2].split().strip()
for the_product in row[2::]:
usrid.append(row[0].strip())
price.append(row[1].strip())
product.append(the_product.strip())
askProduct = raw_input('What Product do you wish to know the price of?: ')
abc = [i for i, x in enumerate(product) if x == askProduct]
thePrice = [ price[p] for p in abc]
print ('the price of product',askProduct, 'is', thePrice)
UPDATE
import csv
with open('data.csv') as csvfile:
readCSV = csv.reader(csvfile, delimiter=',', skipinitialspace=True)
usrid = []
price = []
product = []
for row in readCSV:
for the_product in row[2::]:
usrid.append(row[0])
price.append(float(row[1]))
product.append(the_product)
askProduct = raw_input('What Product do you wish to know the price of?: ')
abc = [i for i, x in enumerate(product) if x == askProduct]
thePrice = [price[p] for p in abc]
print ('the price of product',askProduct, 'is', min(thePrice))
它不是完美的,但是可以按您想要的方式工作。
import argparse
import csv
parser = argparse.ArgumentParser(description='What Product do you wish to know the price of?:')
parser.add_argument('csvFileName',metavar='f', type=str,
help='a csv file with , as delimiter')
parser.add_argument('item1', type=str,
help='a first item')
parser.add_argument('item2', type=str,
help='a second item')
args = parser.parse_args()
with open(args.csvFileName) as csvfile:
readCSV = csv.reader(csvfile, delimiter=',')
listOfProduct = []
#Fetch csv
for row in readCSV:
item = (row[0].replace(' ', ''), row[1].replace(' ', ''), row[2].replace(' ', ''))
listOfProduct.append(item)
#Find all user corresponding with product
item1found = [product for product in listOfProduct if product[2] == args.item1]
item2found = [product for product in listOfProduct if product[2] == args.item2]
allUserProducts = []
#Find item1 that corresponding with item2
for item in item1found:
(userId, price, product) = item
otherUserProducts = [product for product in item2found if product[0] == userId]
otherUserProducts.append(item)
allUserProducts.append(otherUserProducts)
for userProducts in allUserProducts:
totalPrice = 0
for product in userProducts:
(userId, price, product) = product
totalPrice += float(price)
print '(' + str(userId) + ')','(' + str(totalPrice)+ ')'
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