file_name = "C:/Users/cheng/Desktop/can.jmx"
with open(file_name, 'rt', ) as can:
 print(can.read())

file_name = "C:/Users/cheng/Desktop/can.jmx"
with open(file_name, 'rb', ) as can:
 print(can.read())

file_name = "C:/Users/cheng/Desktop/can.jmx"
with open(file_name, 'rb', ) as can:
	#讀取文本文件，size是以字符為單位的
	#讀取二進(jìn)制文件，size是以字節(jié)為單位的
 print(can.read(100))

file_name = "C:/Users/cheng/Desktop/can.jmx"
with open(file_name, 'rb', ) as can:
 # 定義一個(gè)新的文件
 new_name = 'to.jmx'
 with open(new_name, 'wb') as cheng:
  # 定義每次讀取的大小
  cc = 1024 * 100
  while True:
# 從已有對象中讀取數(shù)據(jù)
content = can.read(cc)
#內(nèi)容讀取完畢，終止循環(huán)
if not content:
 break
#將讀取到的數(shù)據(jù)寫入到新對象中
cheng.write(content)