35. Some Dont's for Python .
I am writing code in Python these days and these are a few practices that I am definitely avoiding!!
- Using manual string formatting (+ signs) instead of f strings
Instead of
print("Wow" + name + "!")
use
print(f"Wow {name}!")
- Using bare except clause.
This is wrong:
try:
break
except:
This is because user-interrupts in Python are propogated as exceptions. So if you Ctrl+C
for such code, it wont really exit, it will execute whatever is in the except
block
So use
try:
break
except Exception:
- Using == to check if None, True or False
Instead of:
if x == None:
if x == True:
if x == False:
use:
if x is None:
if x is True:
if x is False:
Use Identity instead of Equality!
- Checking bool or len
Instead of:
if bool(x):
if len(x)!=0:
you can directly use:
if x:
- Don't use range-length for for loops
Instead of:
a = [1, 2, 3]
for i in range(len(a)):
v = a[i]
print(v)
simply use:
a = [1, 2, 3]
for v in a:
print(v)
and in case you want indices use enumerate:
a = [1, 2, 3]
for i, v in enumerate(a):
print(i) #index
print(v) #value