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python - 如何跳过文本文件的前两行？

问题描述

这是我的代码

from collections import Counter 
counter = Counter()
with open('demo.txt') as f:
    for line in f:
        splits = line.split(';')
        change = float(splits[6])
        country = splits[1].strip()
        counter[country] += change
#Percentage Change By Countries"
print()
print ("Percentage Change By Countries")
for country, change_sum in counter.most_common():
    print(country, change_sum,"%")

这是文本文件“Demo.txt”

World Population Data 2019 from the United Nations
Rank; Country; 2018; 2019; % Share; Pop Change; % Change; Continent
1; China; 1427647786; 1433783686; 18.6; 6135900; 0.43; Asia
2; India; 1352642280; 1366417754; 17.7; 13775474; 1.02; Asia
3; United States of America; 327096265; 329064917; 4.27; 1968652; 0.60; North America
4; Indonesia; 267670543; 270625568; 3.51; 2955025; 1.10; Asia
5; Pakistan; 212228286; 216565318; 2.81; 4337032; 2.04; Asia
6; Brazil; 209469323; 211049527; 2.74; 1580204; 0.75; South America
7; Nigeria; 195874683; 200963599; 2.61; 5088916; 2.60; Africa
8; Bangladesh; 161376708; 163046161; 2.11; 1669453; 1.03; Asia
9; Russian Federation; 145734038; 145872256; 1.89; 138218; 0.09; Europe
10; Mexico; 126190788; 127575529; 1.65; 1384741; 1.10; North America

我尝试了 readlines() 但收到错误“超出范围”。如何跳过前两行？

标签： pythonpython-3.x

解决方案

如果你想跳过前n行，你可以调用next文件对象n次：

with open("demo.txt") as f:
    for _ in range(2):
        next(f)
    for line in f:
        ...

此解决方案避免了调用f.readlines()，它将分配一个包含所有行的列表，然后您将其切片以分配另一个列表。

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