python逐行读取文本

f = open("foo.txt")               # 返回一个文件对象  
line = f.readline()               # 调用文件的 readline()方法  
while line:  
    print line,                   # 后面跟 ',' 将忽略换行符  
    #print(line, end = '')　      # 在 Python 3 中使用  
    line = f.readline()   
f.close()

for line in open("foo.txt"):   
    print line

file_object = open('thefile.txt')  
try:  
     all_the_text = file_object.read()  
finally:  
     file_object.close()

input = open('data', 'rb')

chunk = input.read(100)