Python使用range的for循环输出重复 如何调整避免重复打印历史结果

打印和DataFrame生成的代码写在for循环内部，每爬取1条数据就会将当前已爬取的所有数据打印一次，导致出现累加重复输出的效果。

仅需要将df = pd.DataFrame(song_list)和print(df)两行代码移出for循环，放在循环执行结束后的位置即可，不需要修改range控制循环的逻辑。
另外你代码里的if _ == Exception: break逻辑无效，可以直接删除，_是循环迭代的计数变量，永远不可能等于Exception类。

import time
from selenium import webdriver
import selenium
from selenium.webdriver.chrome import service
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
import pandas as pd

ser= Service("C:\Program Files (x86)\chromedriver.exe")
options = webdriver.ChromeOptions()
options.add_experimental_option('excludeSwitches', ['enable-logging'])
driver = webdriver.Chrome(options=options,service=ser)
driver.get('https://soundcloud.com/jujubucks')
print(driver.title)

wait = WebDriverWait(driver,30)

wait.until(EC.element_to_be_clickable((By.ID,"onetrust-accept-btn-handler"))).click()

try:  
    song_list = []
    i = 1
    for _ in range(20):
        song_contents = driver.find_element(By.XPATH, "//li[@class='soundList__item'][{}]".format(i))
        driver.execute_script("arguments[0].scrollIntoView(true);",song_contents)
        search = song_contents.find_element(By.XPATH, ".//a[contains(@class,'soundTitle__username')]/span").text
        search_song = song_contents.find_element(By.XPATH, ".//a[contains(@class,'soundTitle__title')]/span").text
        search_date = song_contents.find_element(By.XPATH, ".//time[contains(@class,'relativeTime')]/span").text
        search_plays = song_contents.find_element(By.XPATH, ".//span[contains(@class,'sc-ministats-small')]/span").text
        i+=1

        option ={
        'Artist': search, 
        'Song_title': search_song, 
        'Date': search_date,
        'Streams': search_plays
        }
        song_list.append(option)
    # 循环结束后再生成DataFrame并打印
    df = pd.DataFrame(song_list)
    print(df)

except Exception:
    pass        

driver.quit()

调整后会等20条数据全部爬取完成后，仅打印一次完整的20条数据列表。

内容的提问来源于stack exchange，提问作者Houston Khanyile