On 06/02/13 08:08, Hs Hs wrote:
Here is what I do :
f1 = open('test','r')
da = f1.read().split('\n')
dat = da[:-1]
dat
mpos = []
for i in range(len(dat)):
if dat[i].startswith('>'):
mpos.append(i)
mpos
[0, 3, 6, 9]
for item in range(len(mpos)):
start = mpos[item]
enda = item+1
end = mpos[enda]-1
head = dat[start]
block = dat[start+1:end]
for i in block:
print head+'\t'+i
You are thinking like a C programmer, not a Python programmer. You should
almost never need to iterate over a range of numbers like this.
Instead, try something like this:
f = open('test')
head = '----'
for line in f:
if line.startswith('>'):
head = line[1:].rstrip() # remove trailing newline
else:
print head + '\t' + line
f.close()
In general, you should iterate over collections of data directly. For example:
# WRONG
for i in range(len(data)):
x = data[i]
print x
# RIGHT
for x in data:
print x
# WRONG
for i in range(len(data)):
x = data[i]
if x == 'spam':
data[i] = 'ham'
# RIGHT
for i, x in enumerate(data):
if x == 'spam':
data[i] = 'ham'
Hope this helps.
--
Steven
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