更新旧Python代码-CSV读取&；打印程序

我正在尝试更新一些代码。我正在学习Python3，想知道是否可以用字典或元组做得更好？代码查看csv文件并打印出值。我正在尝试更新代码，使其更简单、更健壮（如果可能的话）

使用样本数据如下：

品牌、型号、年份、颜色、发动机尺寸、最高转速、变速箱
宝马，X62018，黑色，4L，240，手动

---

我知道DictReader将使用顶行作为列名，我希望遍历每一行并将值打印到屏幕上。

您不需要每列有一个字典：您只需要解析中的

行的
列表/dict
（每一行都是dict）。这段代码以“行号”作为键将行存储在dict中（它从不将这个数字用于任何事情，因此您可以简单地使用列表）

创建解调数据：

# use a sample piece of data as:
with open("csv_test.csv","w") as f:
    f.write("""brand,model,year,colour,engine_size,top_speed,transmission
bmw,X6,2018,black,4L,240,manual
bmw,X7,2019,green,4L,240,manual
bmw,X8,2020,yellow,4L,240,manual
""")

import csv

data = {}
with open("csv_test.csv", 'r') as csvFile:
    reader = csv.DictReader(csvFile)
    for num,row in enumerate(reader):  # num gives you the row number if you really need it
        data[num] = row  # put the line of your file into dict, row number is key

print(data)

# print data "nicely" 
for d in data:
    # get the maximum lenght for your keys to allow a nice formatting
    max_key = max(len(i) for k in data for i in data[k]) 
    for k in data[d]:
        # format the key to max length so data is aligned
        print(f"{k:{max_key}}\t{data[d][k]}")
    print()

# print data in lines
for d in data:
    print(*data[d].values(), sep="\t")

加载/打印数据：

# use a sample piece of data as:
with open("csv_test.csv","w") as f:
    f.write("""brand,model,year,colour,engine_size,top_speed,transmission
bmw,X6,2018,black,4L,240,manual
bmw,X7,2019,green,4L,240,manual
bmw,X8,2020,yellow,4L,240,manual
""")

import csv

data = {}
with open("csv_test.csv", 'r') as csvFile:
    reader = csv.DictReader(csvFile)
    for num,row in enumerate(reader):  # num gives you the row number if you really need it
        data[num] = row  # put the line of your file into dict, row number is key

print(data)

# print data "nicely" 
for d in data:
    # get the maximum lenght for your keys to allow a nice formatting
    max_key = max(len(i) for k in data for i in data[k]) 
    for k in data[d]:
        # format the key to max length so data is aligned
        print(f"{k:{max_key}}\t{data[d][k]}")
    print()

# print data in lines
for d in data:
    print(*data[d].values(), sep="\t")

输出：

如果您只想将数据排成行，请使用：

# use a sample piece of data as:
with open("csv_test.csv","w") as f:
    f.write("""brand,model,year,colour,engine_size,top_speed,transmission
bmw,X6,2018,black,4L,240,manual
bmw,X7,2019,green,4L,240,manual
bmw,X8,2020,yellow,4L,240,manual
""")

import csv

data = {}
with open("csv_test.csv", 'r') as csvFile:
    reader = csv.DictReader(csvFile)
    for num,row in enumerate(reader):  # num gives you the row number if you really need it
        data[num] = row  # put the line of your file into dict, row number is key

print(data)

# print data "nicely" 
for d in data:
    # get the maximum lenght for your keys to allow a nice formatting
    max_key = max(len(i) for k in data for i in data[k]) 
    for k in data[d]:
        # format the key to max length so data is aligned
        print(f"{k:{max_key}}\t{data[d][k]}")
    print()

# print data in lines
for d in data:
    print(*data[d].values(), sep="\t")

输出：

相关的：



您不需要每列一本词典：您只需要解析中的
行的
列表/dict
（每行都是dict）。这段代码以“行号”作为键将行存储在dict中（它从不将这个数字用于任何事情，因此您可以简单地使用列表）

创建解调数据：

# use a sample piece of data as:
with open("csv_test.csv","w") as f:
    f.write("""brand,model,year,colour,engine_size,top_speed,transmission
bmw,X6,2018,black,4L,240,manual
bmw,X7,2019,green,4L,240,manual
bmw,X8,2020,yellow,4L,240,manual
""")

import csv

data = {}
with open("csv_test.csv", 'r') as csvFile:
    reader = csv.DictReader(csvFile)
    for num,row in enumerate(reader):  # num gives you the row number if you really need it
        data[num] = row  # put the line of your file into dict, row number is key

print(data)

# print data "nicely" 
for d in data:
    # get the maximum lenght for your keys to allow a nice formatting
    max_key = max(len(i) for k in data for i in data[k]) 
    for k in data[d]:
        # format the key to max length so data is aligned
        print(f"{k:{max_key}}\t{data[d][k]}")
    print()

# print data in lines
for d in data:
    print(*data[d].values(), sep="\t")

加载/打印数据：

# use a sample piece of data as:
with open("csv_test.csv","w") as f:
    f.write("""brand,model,year,colour,engine_size,top_speed,transmission
bmw,X6,2018,black,4L,240,manual
bmw,X7,2019,green,4L,240,manual
bmw,X8,2020,yellow,4L,240,manual
""")

import csv

data = {}
with open("csv_test.csv", 'r') as csvFile:
    reader = csv.DictReader(csvFile)
    for num,row in enumerate(reader):  # num gives you the row number if you really need it
        data[num] = row  # put the line of your file into dict, row number is key

print(data)

# print data "nicely" 
for d in data:
    # get the maximum lenght for your keys to allow a nice formatting
    max_key = max(len(i) for k in data for i in data[k]) 
    for k in data[d]:
        # format the key to max length so data is aligned
        print(f"{k:{max_key}}\t{data[d][k]}")
    print()

# print data in lines
for d in data:
    print(*data[d].values(), sep="\t")

输出：

如果您只想将数据排成行，请使用：

# use a sample piece of data as:
with open("csv_test.csv","w") as f:
    f.write("""brand,model,year,colour,engine_size,top_speed,transmission
bmw,X6,2018,black,4L,240,manual
bmw,X7,2019,green,4L,240,manual
bmw,X8,2020,yellow,4L,240,manual
""")

import csv

data = {}
with open("csv_test.csv", 'r') as csvFile:
    reader = csv.DictReader(csvFile)
    for num,row in enumerate(reader):  # num gives you the row number if you really need it
        data[num] = row  # put the line of your file into dict, row number is key

print(data)

# print data "nicely" 
for d in data:
    # get the maximum lenght for your keys to allow a nice formatting
    max_key = max(len(i) for k in data for i in data[k]) 
    for k in data[d]:
        # format the key to max length so data is aligned
        print(f"{k:{max_key}}\t{data[d][k]}")
    print()

# print data in lines
for d in data:
    print(*data[d].values(), sep="\t")

输出：

相关的：



如果您只需要这些行，为什么需要这么多词典？对于简单地打印值a
print（*row）
就足够了……嘿，帕特里克，我想问的是，这是最好的还是最简单的方法，还是有更简单的方法？打印时，我想展示宝马X6 2018黑色4L 240手册，这可能不是最好的方式，因为您没有打印任何内容。但希望你知道如何打印？如果你只需要行，为什么你会想要这么多字典？对于简单地打印值a
print（*row）
就足够了……嘿，帕特里克，我想问的是，这是最好的还是最简单的方法，还是有更简单的方法？打印时，我想展示宝马X6 2018黑色4L 240手册，这可能不是最好的方式，因为您没有打印任何内容。但希望你知道怎么打印？