arr = [12, 5, 33, 4, 1]
#遍歷輸出1
for i in range(0, len(arr)):
    item = arr[i]
    print(item)

#遍歷輸出2
for item in arr:
    print(item)

#遍歷輸出3
string_arr = ["hi", "hello", "你好", "aloha"]
for item in string_arr:
    print("本次循環(huán) item 變量的值", item)

import csv
#打開csv
fo = open("info.csv")
#打開csv文件的文件對象作為參數(shù)來創(chuàng)建dictreader類的對象，存在reader變量中
reader = csv.DictReader(fo)
#調(diào)用reader對象的filednames屬性，獲取csv文件表格的開頭
headers = reader.fieldnames
#關(guān)閉文件
fo.close()
#打印
print(headers)

fo = open("info.csv")
reader = csv.DictReader(fo)
#創(chuàng)建列表，存儲讀到的行
row_list = []
#遍歷
for row in reader:
    row_list.append(row)
fo.close()
#打印
print(row_list[0])
#遍歷row_list
for d in row_list:
    #d是字典，直接打印key為年齡值即可
    print(d["年齡"])
#打印

import csv
#打開一個(gè)文件，假設(shè)是info.csv，寫入所以是w
#newline=''，寫入時(shí)需要指定
fo = open("info2.csv", "w", newline='')
#將表頭存儲到一個(gè)列表里
header = ["姓名", "年齡", "部門"]
#創(chuàng)建一個(gè)DictWriter對象，第二個(gè)參數(shù)就是上面創(chuàng)建的表頭
writer = csv.DictWriter(fo, header)
writer.writeheader()
#寫入一行記錄，以字典的形式，key需要與表頭對應(yīng)
writer.writerow({"姓名": "小明", "年齡":"28", "部門": "行政部"})
#關(guān)閉文件
fo.close()

from bs4 import BeautifulSoup
def create_doc_from_filename(filename):
    fo = open(filename, "r", encoding='utf-8')
    html_content = fo.read()
    fo.close
    doc = BeautifulSoup(html_content)
    return doc

#輸入?yún)?shù)是BeautifulSoup對象，返回包含新聞的div元素列表
def find_index_labels(doc):
    index_labels = doc.find_all("div", class_ = "indexs")
    return index_labels

#實(shí)現(xiàn)新聞標(biāo)題的抽取函數(shù)
def get_title(label_object):
    #從剛才的參數(shù)傳入的標(biāo)簽對象中過濾出所有的target = _blank的a標(biāo)簽
    a_labels = label_object.find_all("a", target = "_blank")
    #取得第一個(gè)標(biāo)簽對象
    my_label = a_labels[0]
    #將標(biāo)簽的文字內(nèi)容作為返回值返回
    return my_label.get_text()

#實(shí)現(xiàn)獲取新聞發(fā)布時(shí)間的函數(shù)
def get_pub_time(label_object):
    #找到class = comment-link的span標(biāo)簽
    spans = label_object.find_all("span", class_ = "comment-link")
    #取第一個(gè)
    span = spans[0]
    #返回標(biāo)題屬性
    return span["title"]

#獲取新聞標(biāo)題與列表
#調(diào)用create_doc_from_filename函數(shù)
doc = create_doc_from_filename("jiandan.html")
#傳入BeautifulSoup對象，將返回的div列表存儲在index_labels中
index_labels = find_index_labels(doc)
for label_object in index_labels:
    title = get_title(label_object)
    pub_time = get_pub_time(label_object)
    print("標(biāo)題", title)
    print("發(fā)布時(shí)間", pub_time)

#獲取新聞標(biāo)題與列表
#調(diào)用create_doc_from_filename函數(shù)
doc = create_doc_from_filename("jiandan.html")
#傳入BeautifulSoup對象，將返回的div列表存儲在index_labels中
index_labels = find_index_labels(doc)
news_dict_list = []
for label_object in index_labels:
    title = get_title(label_object)
    pub_time = get_pub_time(label_object)
    news = {"標(biāo)題": title, "發(fā)布時(shí)間": pub_time}
    news_dict_list.append(news)
print(news_dict_list)

#創(chuàng)建csv
fo = open("news.csv", "w", newline='', encoding='utf-8')
#表頭
header = ["標(biāo)題", "發(fā)布時(shí)間"]
writer = csv.DictWriter(fo, header)
#寫入表頭
writer.writeheader()
#將上一步的字典寫入csv文件中
writer.writerows(news_dict_list)
fo.close()