beginner question fibonacci

[Joon]

 >>> # Fibonacci series:
... # the sum of two elements defines the next
... a, b = 0, 1
 >>> while b < 10:
...   print b
...   a, b = b, a+b
...
1
1
2
3
5
8



 >>> a, b = 0, 1
 >>> while b < 10:
print b
a = b
b = a+b


1
2
4
8

Why a, b = b, a+b isn't a = b; b = a+b ?
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Re: beginner question fibonacci

[Joon]

Yes, i see.
Thank you very much for the fast help!
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Delete duplicate rows in textfile - except it contains a "{" or "}"

[Joon Ki Choi]

Hello Pythonistas,

i have a very large textfile with contents like:

@INBOOK{Ackermann1999-b,
  author = {Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and 
Ackermann,
K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F.
and Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and
Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and 
Ackermann,
K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F.
and Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and
Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and 
Ackermann,
K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F.
and Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and
Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and 
Ackermann},
  year = {1980},
  timestamp = {1995-12-02}
}   

And i want to delete the duplicate rows except these rows containing the 
brackets { or }. 
The result should look like:

@INBOOK{Ackermann1999-b,
  author = {Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and 
Ackermann,
Ackermann, K.-F. and Ackermann, K.-F. and Ackermann, K.-F. and 
Ackermann},
  year = {1980},
  timestamp = {1995-12-02}
}

I come across with this Python-Skript:

lines_seen = set() # holds lines already seen
outfile = open("literatur_clean.txt", "w")
for line in open("literatur_dupl.txt", "r"):
if line not in lines_seen: # not a duplicate
outfile.write(line)
lines_seen.add(line)
outfile.close()

But it deletes also the lines with a closing bracket } and the lines with the 
same authordata.
Therefor i need the condition of the brackets.

Could someone point me out to adding this condition?

Thanks in advance,
Joon




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Re: Delete duplicate rows in textfile - except it contains a "{" or "}"

[Joon Ki Choi]

lines_seen = set() # holds lines already seen
outfile = open("literatur_clean.txt", "w")
for line in open("literatur_dupl.txt", "r"):
if ('{' in line or '}' in line) or line not in lines_seen:
outfile.write(line)
lines_seen.add(line)
outfile.close()
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