for x in open()从文件中读取行。以文本块的形式读取整个文件，然后遍历文本的每个字符：
import sys
def is_float(n):
state = 0
src = ""
ch = n
if state == 0:
if ch.isdigit():
src += ch
state = 1
...
data = open("file.data", 'r').read()
for n in data: # characters
sys.stdout.write("%12.8e\n" % is_float(n))
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