Convert str to int

[florian]

Hello,

I'm kind of feeling Python is making fun of me. I have strings with dates in the format "20200716", stored as the values in a dictionary.
With a for-loop I am extracting them and slice them into year, month and day. In order to be able to pass them onto the datetime.date-function (that's why I remove the leading zeros from month and day), I want to convert them to integers. So far so easy:

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year = str() month = str() day = str() for k,v in my_dict.items():     date = str(v)     year = date[:4]     month = date[3:5]     day = date[5:]     month = month.lstrip("0")     day = day.lstrip("0")     year = int(year)     month = int(month)     day = int(day)

Unfortunately I get the following error:

1 2	month = int(month) ValueError: invalid literal for int() with base 10: ''

I've already printed "month" out, it is a digit. I've checked with isdigit(), True, it is a number.
The weird thing is, when I change the slicing operation of month to

1	month = date[0:5]

it works just fine. Although now I don't have the isolated month.
The online difference is the [0:5] instead of [3:5].

What the heck is going on here?

[Larz60+]

please show example of original format and expected output.
if it's a string to start with, why not slice the string first and then convert components to integers?

[perfringo]

Year is [:4] and month is [3:5]. If 20200716 is given then month will be 00. If one strips zeros from that one will get empty string and this is exactly what this ValueError is about.

[buran]

the indexes for month are incorrect

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>>> spam = '20200716' >>> spam[3:5] '00'

also, that's complicated conversion

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>>> from datetime import datetime >>> eggs = datetime.strptime(spam, '%Y%m%d') >>> eggs.year 2020 >>> type(eggs.year) <class 'int'>

[Larz60+]

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>>> mydate = '20200716' >>> year = mydate[:4] >>> year '2020' >>> month = mydate[4:-2] >>> month '07' >>> day = mydate[-2:] >>> day '16'

[Axel_Erfurt]

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from datetime import date   timestamp = "20200716" d = date(int(timestamp[:4]), int(timestamp[4:6]), int(timestamp[6:8])) dt = d.strftime("%-d.%B %Y") print(dt)

Output:
16.July 2020

[snippsat]

Pendulum is what i use most now as dos dates better than everything else in Python.

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>>> import pendulum >>> >>> date = "20200716" >>> date = pendulum.parse(date) >>> date DateTime(2020, 7, 16, 0, 0, 0, tzinfo=Timezone('UTC')) >>> print(date) 2020-07-16T00:00:00+00:00 >>> >>> date.year 2020 >>> date.month 7 >>> date.day 16 >>> >>> date.to_day_datetime_string() 'Thu, Jul 16, 2020 12:00 AM' >>> date.to_rfc850_string() 'Thursday, 16-Jul-20 00:00:00 UTC' >>> date.to_atom_string() '2020-07-16T00:00:00+00:00' >>> date.to_date_string() '2020-07-16' >>> >>> now = pendulum.now() >>> print(now) 2020-07-17T21:32:55.008649+02:00 >>> now.diff_for_humans(date) '1 day after'