# Week3 Assessment

### Web Crawling- Genie Music

Scrap rank, title, and singer from the Genie music.

Reference; [Genie Music](https://www.genie.co.kr/chart/top200?ditc=M&rtm=N&ymd=20210701)
![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1660714660685/CEtPh_8WG.png align="left")

<hr>

- create a file named 'genie.py' 

- add the basic structure of web crawling.

```
import requests
from bs4 import BeautifulSoup

# 타겟 URL을 읽어서 HTML를 받아오고,
headers = {'User-Agent' : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36'}
data = requests.get('https://movie.naver.com/movie/sdb/rank/rmovie.naver?sel=pnt&date=20210829',headers=headers)

# HTML을 BeautifulSoup이라는 라이브러리를 활용해 검색하기 용이한 상태로 만듦
# soup이라는 변수에 "파싱 용이해진 html"이 담긴 상태가 됨
# 이제 코딩을 통해 필요한 부분을 추출하면 된다.
soup = BeautifulSoup(data.text, 'html.parser')

#############################
# (입맛에 맞게 코딩)
#############################
```

- change the url.

```
import requests
from bs4 import BeautifulSoup

# 타겟 URL을 읽어서 HTML를 받아오고,
headers = {'User-Agent' : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36'}
data = requests.get('https://www.genie.co.kr/chart/top200?ditc=M&rtm=N&ymd=20210701',headers=headers)

# HTML을 BeautifulSoup이라는 라이브러리를 활용해 검색하기 용이한 상태로 만듦
# soup이라는 변수에 "파싱 용이해진 html"이 담긴 상태가 됨
# 이제 코딩을 통해 필요한 부분을 추출하면 된다.
soup = BeautifulSoup(data.text, 'html.parser')
```

- `print(soup)` to test the code.

<hr>

#### Rank.

- click on copy selector for the first and second rank and paste it.
![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1660720219166/LmfglSs1o.png align="left")

> these have the same code until `tr`
![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1660720325676/EJP2xswYF.png align="left")

- write a code like the below.

`trs = soup.select('#body-content > div.newest-list > div > table > tbody > tr')`


- write `for()` statement.

```
import requests
from bs4 import BeautifulSoup

headers = {'User-Agent' : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36'}
data = requests.get('https://www.genie.co.kr/chart/top200?ditc=M&rtm=N&ymd=20210701',headers=headers)

soup = BeautifulSoup(data.text, 'html.parser')

#body-content > div.newest-list > div > table > tbody > tr:nth-child(1) > td.number
#body-content > div.newest-list > div > table > tbody > tr:nth-child(2) > td.number

trs = soup.select('#body-content > div.newest-list > div > table > tbody > tr')

for tr in trs:
    rank = tr.select_one('td.number')
    print(rank)
```

(copy selectors can be deleted)

```
import requests
from bs4 import BeautifulSoup

headers = {'User-Agent' : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36'}
data = requests.get('https://www.genie.co.kr/chart/top200?ditc=M&rtm=N&ymd=20210701',headers=headers)

soup = BeautifulSoup(data.text, 'html.parser')

trs = soup.select('#body-content > div.newest-list > div > table > tbody > tr')

for tr in trs:
    rank = tr.select_one('td.number')
    print(rank)
```
![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1660720607900/dl0dYPAjQ.png align="left")


- let's run `print(rank.text)`
![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1660720646928/JVEjiWyEp.png align="left")


- We need to use `text[0:2]`

```
import requests
from bs4 import BeautifulSoup

headers = {'User-Agent' : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36'}
data = requests.get('https://www.genie.co.kr/chart/top200?ditc=M&rtm=N&ymd=20210701',headers=headers)

soup = BeautifulSoup(data.text, 'html.parser')

trs = soup.select('#body-content > div.newest-list > div > table > tbody > tr')

for tr in trs:
    rank = tr.select_one('td.number')
    print(rank.text[0:2])
```
![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1660720705401/chzRR9B6P.png align="left")


- to delete blanks, we need to use `strip()`

```
import requests
from bs4 import BeautifulSoup

headers = {'User-Agent' : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36'}
data = requests.get('https://www.genie.co.kr/chart/top200?ditc=M&rtm=N&ymd=20210701',headers=headers)

soup = BeautifulSoup(data.text, 'html.parser')

trs = soup.select('#body-content > div.newest-list > div > table > tbody > tr')

for tr in trs:
    rank = tr.select_one('td.number')
    print(rank.text[0:2].strip())
```
![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1660720758845/lq81zfKfO.png align="left")


- `.text[0:2].strip()` can be added to the end of `rank` code.

```
for tr in trs:
    rank = tr.select_one('td.number')
    print(rank.text[0:2].strip())
```

to 

```
for tr in trs:
    rank = tr.select_one('td.number').text[0:2].strip()
    print(rank)
```

<hr>

#### Title

- click on copy selector and paste it.
![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1660720919419/1S3RR0c9a.png align="left")

`#body-content > div.newest-list > div > table > tbody > tr:nth-child(1) > td.info > a.title.ellipsis`

> we need the part after `td` in the code.

`title = tr.select_one('td.info > a.title.ellipsis')`

- print title
```
for tr in trs:
    rank = tr.select_one('td.number').text[0:2].strip()
    title = tr.select_one('td.info > a.title.ellipsis')
    print(title)
```

- add `.text` and `strip()` and add them to the end of title.

```
for tr in trs:
    rank = tr.select_one('td.number').text[0:2].strip()
    title = tr.select_one('td.info > a.title.ellipsis').text.strip()
    print(title)
```

<hr>

#### Artist.

- add `artist = tr.select_one('td.info > a.artist.ellipsis')`

- add `.text`

`artist = tr.select_one('td.info > a.artist.ellipsis').text`

```
for tr in trs:
    rank = tr.select_one('td.number').text[0:2].strip()
    title = tr.select_one('td.info > a.title.ellipsis').text.strip()
    artist = tr.select_one('td.info > a.artist.ellipsis').text
    print(artist)
```

<hr>

- print things we want to see.

```
import requests
from bs4 import BeautifulSoup

headers = {'User-Agent' : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36'}
data = requests.get('https://www.genie.co.kr/chart/top200?ditc=M&rtm=N&ymd=20210701',headers=headers)

soup = BeautifulSoup(data.text, 'html.parser')

trs = soup.select('#body-content > div.newest-list > div > table > tbody > tr')

for tr in trs:
    rank = tr.select_one('td.number').text[0:2].strip()
    title = tr.select_one('td.info > a.title.ellipsis').text.strip()
    artist = tr.select_one('td.info > a.artist.ellipsis').text
    print(rank, title, artist)
```