Python 2.7 如何在python中结束while循环?
我有一个简单的习惯,永不放弃Python 2.7 如何在python中结束while循环?,python-2.7,Python 2.7,我有一个简单的习惯,永不放弃 import sys infile = sys.argv[1] outfile = sys.argv[2] count=1 print 'Input file is ', infile print 'Output file is ', outfile instream = open(infile,'r') while True: line=instream.readline() if line[0:5]=='<?xml':
import sys
infile = sys.argv[1]
outfile = sys.argv[2]
count=1
print 'Input file is ', infile
print 'Output file is ', outfile
instream = open(infile,'r')
while True:
line=instream.readline()
if line[0:5]=='<?xml':
print 'new record', count
count=count+1
if line == "eof":
print 'end'
break
导入系统
infle=sys.argv[1]
outfile=sys.argv[2]
计数=1
打印“输入文件为”,填充
打印“输出文件为”,输出文件
河道内=开阔(填充,'r')
尽管如此:
行=流内读取行()
如果第[0:5]行=='readline()
没有返回表示文件结束的字符串eof
;它返回空字符串。(注意readline
保留了终止每一行的换行符,因此空行将表示为'\n'
;因此真正的空行只能表示没有留下任何数据。)
你可以写
但通常您只是将文件视为迭代器:
for line in instream:
if line[0:5] == '<?xml':
print 'new record', count
count = count + 1
用于流内管线:
如果行[0:5]='
for line in instream:
if line[0:5] == '<?xml':
print 'new record', count
count = count + 1