Python input() for ENTER

Question

What is input for ENTER key?

tf_end=str(input("TF end: "))
tfend={"":7,'1':0,'2':1,'3':2,'5':3,'10':4,'15':5,'30':6,'1h':7}
while not any(x in tfend.keys() for x in tf_end):  
      tf_end=str(input("TF end: "))

Because I do above logic but "" is not equal to ENTER (cannot escape while loop). How to escape this while loop by using ENTER key?

Note, str(input(...)) is redundant. input always returns a str — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Jun 12, 2021 at 23:50
@juanpa.arrivillaga might be a bad habit left over from Python 2. — Mark Ransom
– Mark Ransom, Commented Jun 13, 2021 at 1:46

wjandrea · Accepted Answer · 2021-06-12 23:23:37Z

1

When you only press Enter, input() returns the empty string. Your code doesn't work because any() of an empty iterable is False. Also note that it only happens to work for the multi-character keys because their first characters are also keys.

It looks like you're using any() by accident. Use if not tf_end in tfend instead.

I would make a few other changes too:

tfend = {'': 7, '1': 0, '2': 1, '3': 2, '5': 3, '10': 4, '15': 5, '30': 6, '1h': 7}
tf_end = None  # Sentinel value instead of a duplicate `input()`
while not tf_end in tfend:  # `.keys()` is implied
    tf_end = input("TF end: ")  # `str()` is redundant

answered Jun 12, 2021 at 23:23

wjandrea

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2 Comments

uyin Over a year ago

Cannot work..how to declare ENTER into list?

wjandrea Over a year ago

@uyin What do you mean?

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