时间:2021-08-01 python教程 查看: 922
使用try进行异常发现,使用while检测文件末尾进行读取
file_to_read = raw_input("Enter file name of tests (empty string to end program):")
try:
infile = open(file_to_read, 'r')
while file_to_read != " ":
file_to_write = raw_input("Enter output file name (.csv will be appended to it):")
file_to_write = file_to_write + ".csv"
outfile = open(file_to_write, "w")
readings = (infile.readline())
print readings
while readings != 0:
global count
readings = int(readings)
minimum = (infile.readline())
maximum = (infile.readline())
使用for遍历读取的每一行,进行一次性的读取和输入
下面调用的程序读取的数据是
result = list()
with open('../test/parameter.txt') as f:
for line in f.readlines():
temp = list()
# 逐个遍历对应每一行元素,将之转为对应的数据
b = line.strip(",][").split(',')
if(len(b) >= 5):
b.pop()
for a in b:
a = a.replace('[','').replace(']','')
temp.append(float(a))
result.append(temp)
#print("中途打印的temp是",temp)
#print("加入到result中的结果是",result)
删除字符串首尾的多余字符串strip()
# 删除字符串中多余字符
def string_remove():
str1 = ' abc \n'
print str1.strip() # abc
str2 = '----abcdf++++'
print str2.strip('-+') # abcdf
replace函数,删除字符串中某一个所有的字符串
ss = 'old old string'
ret = ss.replace('old', 'new', 1)
print(ret)
sub函数,同时删除多个字符串,这里使用了正则表达式
str2 = '\nabc\nwrt22\t666\t' # 删除字符串中的所有\n,\t
import re
print(re.sub('[\n\t]','',str2)) # abcwrt22666
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