python 不同方式读取文件速度不同

1、按行读取较慢较耗时：

 srcFiles = open('inputFile.txt', 'r')
    for file_path in srcFiles:
	    file_path = file_path.rstrip()

2、快速读取所有行：

 with open('inputFile.txt', 'r') as fRead:  
	    	srcPaths = fRead.readlines()	#txt中所有字符串读入list列表srcPaths 
	    	random.shuffle(srcPaths)		#打乱list顺序
	    	for img_path in srcPaths:
	    		img_path = img_path.rstrip()