Python Interviews: Difference between revisions
→"is" vs "=="
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Line 6:
= Open a file =
f = open('text.txt','r')
l = f.readlines()
f.close()
for i in l:
print(i.strip('\n'))
= Read Log File =
* Better way to open a file as it auto closed file, even on crash
<pre>
with open('/var/log/apache2/access.log','r') as file:
for line in file:
print(line.split()[3], line.split()[6], line.split()[8], line.split()[9])
try:
b = b +int(line.split()[9])
except:
pass
print(b)
</pre>
= List Comprehension =
Line 247 ⟶ 264:
'hello world'[::-1]
'dlrow olleh'
= Convert to Positive Number =
>>> a = -30
>>> abs(a)
30
* Interger can be positive or Negative:
>>> int(a)
-30
>>> -a
30
>>> c = 30.9
>>> int(c)
30
= "is" vs "==" =
a = [1,2,3]
b = a
c = [1,2,3]
print(a==c)
print(a is c)
Output:
True
False
= Dictionary =
a = {}
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