import time
def main():
#一次性读取整个文件
with open('url.txt','r', encoding='utf-8') as f:
print(f.read())
#通过for-in 循环逐行读取 'r' 与mode='r'一样
with open('url.txt',mode = 'r') as f:
for line in f:
print(line, end='')
time.sleep(1)
print()
#读取文件按行读取到列表中
with open('url.txt') as f:
lines = f.readlines()
print (lines)
if __name__ == '__main__':
main()
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