Kinh Nghiệm Hướng dẫn Hướng dẫn check empty python Chi Tiết
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How do I make a:
if str(variable) == [contains text]:
condition?
(or something, because I am pretty sure that what I just wrote is completely wrong)
I am sort of trying to check if a random.choice from my list is [“”,] (blank) or contains [“text”,].
Rik Poggi
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asked Mar 29, 2012 13:34
3
You could just compare your string to the empty
string:
if variable != “”:
etc.
But you can abbreviate that as follows:
if variable:
etc.
Explanation: An if actually works by computing a value for the logical expression you give it: True or False. If you simply use a variable name (or a literal string like “hello”) instead of a logical test, the rule is: An empty string counts as False, all other strings count as True. Empty lists and the number zero also count as false, and most other things count as true.
answered Mar 29, 2012
13:46
alexisalexis
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8
The “Pythonic” way to check if a string is empty is:
import random
variable = random.choice(l)
if variable:
# got a non-empty string
else:
# got an empty string
answered Mar 29, 2012 13:35
Daniel LubarovDaniel Lubarov
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Just say if s or if not s. As in
s=””
if not s:
print ‘not’, s
So in your specific example, if I understand it correctly…
>>> import random
>>> l = [”, ‘foo’, ”, ‘bar’]
>>> def default_str(l):
… s = random.choice(l)
… if not s:
… print ‘default’
… else:
… print s
…
>>> default_str(l)
default
>>> default_str(l)
default
>>> default_str(l)
bar
>>> default_str(l)
default
answered Mar 29, 2012 13:36
senderlesenderle
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2
Empty strings are False by default:
>>> if not “”:
… print(“empty”)
…
empty
answered Mar 29, 2012
13:37
bricebrice
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For python 3, you can use bool()
>>> bool(None)
False
>>> bool(“”)
False
>>> bool(“a”)
True
>>> bool(“ab”)
True
>>> bool(“9”)
True
answered Apr 5, 2022 5:05
Thai TranThai Tran
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bronze badges
3
Some time we have more spaces in between quotes, then use this approach
a = ” ”
>>> bool(a)
True
>>> bool(a.strip())
False
if not a.strip():
print(“String is empty”)
else:
print(“String is not empty”)
answered Aug 29, 2022 5:12
kamran kausarkamran kausar
3,6151 gold badge21 silver badges17 bronze badges
element = random.choice(myList)
if element:
# element contains text
else:
# element is empty ”
answered Mar 29, 2012 13:39
eumiroeumiro
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badges259 bronze badges
How do i make an: if str(variable) == [contains text]: condition?
Perhaps the most direct way is:
if str(variable) != ”:
# …
Note that the if not … solutions test the opposite condition.
answered Mar 29, 2012 13:35
NPENPE
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if the variable contains text then:
len(variable) != 0
of it does not
len(variable) == 0
answered Jan 8, 2022 22:34
CESCOCESCO
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use “not” in if-else
x = input()
if not x:
print(“Value is not entered”)
else:
print(“Value is entered”)
answered Mar 6, 2022 10:51
test_str1 = “”
test_str2 = ” ”
# checking if string is empty
print (“The zero length string without spaces is empty ? : “, end = “”)
if(len(test_str1) == 0):
print (“Yes”)
else :
print (“No”)
# prints No
print (“The zero length string with just spaces is empty ? : “, end = “”)
if(len(test_str2) == 0):
print (“Yes”)
else :
print (“No”)
answered Jan 24, 2022 9:52
string = “TEST”
try:
if str(string):
print “good string”
except NameError:
print “bad string”
answered
May 9, 2022 11:03
3
Python strings are immutable and hence have more complex handling when talking about its operations. Note that a string with spaces is actually an empty string but has a non-zero size. Let’s see two different methods of checking if string is empty or not:
Method #1 : Using Len() Using Len() is the most generic method to check for zero-length string. Even though it ignores the fact that a string with just spaces also should be practically considered as an empty string even its non-zero.
Method #2 : Using not
Not operator can also perform the task similar to Len(), and checks for 0 length string, but same as the above, it considers the string with just spaces also to be non-empty, which should not practically be true.
Good Luck!
answered Jan 24, 2022 9:48
#empty variable
myvar = “”
#check if variable is empty
if not myvar:
print(“variable is empty”) # variable is empty
answered Jul 21 4:38
1
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