在Python中打印逗号开头和结尾？

Question

#!/usr/bin/python

for line in open("blah.txt"):
if "$" in line:
    print (","line",")

为什么这样不行？我怎样才能在行首和行尾加个逗号？你知道吗

Answer 1

我想这就是你想要的：

for line in open("blah.txt"):
    if "$" in line:
        print(",{},".format(line.strip()))

Answer 2

试试这个。。。你知道吗

#!/usr/bin/python

f = open("blah.txt");       # open file
for line in f:              # iterate over lines in file
  line = line.strip()       # strip leading and trailing white space
  print ("," + line + ",")  # print line between commas
f.close() # close file      # close file when done

Answer 3

你想要什么还不完全清楚。也许：

print ',%s,' % line