[英]Python: Elegant solution to check if any substring is in list?
Before you close this, please try to understand the question - it's a bit different, but looks like a lot of downvoted questions. 在关闭此步骤之前,请尝试理解问题-有点不同,但是看起来很多问题被否决了。
I'm looking for a simple way to check if any substrings of a string is in a list of strings. 我正在寻找一种简单的方法来检查字符串的任何子字符串是否在字符串列表中。 The input is like
2018_JAN_BGD
, and I want to convert the month info in this to a (year-)quarter info. 输入类似于
2018_JAN_BGD
,我想将此中的月份信息转换为( 2018_JAN_BGD
)季度信息。 For example Q1 would be January, February and March. 例如,第一季度将是一月,二月和三月。 So I'm looking for a way to check if any of the substrings in
2018_JAN_BGD
contains JAN
, FEB
or MAR
. 所以我正在寻找一种方法来检查
2018_JAN_BGD
中的2018_JAN_BGD
字符串2018_JAN_BGD
包含JAN
, FEB
或MAR
。 I could do this by writing 12 (for the whole year) if-else clauses with or's, but I feel like there's a more elegant solution in Python. 我可以通过用or编写12个(全年)if-else子句来做到这一点,但是我觉得Python中有一个更优雅的解决方案。 I'm trying:
我正在努力:
def tellQuarter(month):
Q1 = ('JAN','FEB','MAR')
Q2 = ('APR','MAY','JUN')
Q3 = ('JUL','AUG','SEP')
Q4 = ('OCT','NOV','DEC')
if any(for mon in Q1 in month):
return ("Q1")
if any(for mon in Q2 in month):
return ("Q2")
This is of course incorrect (invalid syntax), but I can't figure out how to put this correctly. 这当然是不正确的(语法无效),但是我不知道如何正确地放置它。 Basically, I want to loop through
Q1
, and check if any of the strings is a substring of month
. 基本上,我想遍历
Q1
,并检查是否有任何字符串是month
的子字符串。
I mean I can do 我是说我能做
for mon in Q1:
if mon in month:
return "Q1"
but isn't there a more elegant, single-line solution to this? 难道没有一个更优雅的单行解决方案吗?
Cheating, but use a dictionary, mapping the months to quarters: 作弊,但使用字典,将月份映射到季度:
monthsToQuarters = {
'JAN': 'Q1','FEB': 'Q1','MAR': 'Q1',
'APR': 'Q2','MAY': 'Q2','JUN': 'Q2',
'JUL': 'Q3','AUG': 'Q3','SEP': 'Q3',
'OCT': 'Q4','NOV': 'Q4','DEC': 'Q4'}
giving you: 给你:
>>> monthsToQuarters['JAN']
'Q1'
you could strip out the month using something like: 您可以使用类似以下方法删除月份:
>>> '2018_JAN_BGD'.split('_')[1]
'JAN'
Avoid repeating logic with a dict: 避免用dict重复逻辑:
QUARTERS = {
'Q1': ('JAN', 'FEB', 'MAR'),
'Q2': ('APR', 'MAY', 'JUN'),
'Q3': ('JUL', 'AUG', 'SEP'),
'Q4': ('OCT', 'NOV', 'DEC'),
}
def tellQuarter(month):
for q, months in QUARTERS.items():
if any(m for m in months if m in month):
return q
raise ValueError("String '{}' does not contain a month.".format(month))
print(tellQuarter('2018_JAN_BGD'))
>>> Q1
You had a syntax error in your list comprehension 您的列表理解中存在语法错误
def tellQuarter(month):
Q1 = ('JAN','FEB','MAR')
Q2 = ('APR','MAY','JUN')
Q3 = ('JUL','AUG','SEP')
Q4 = ('OCT','NOV','DEC')
if any(mon in month for mon in Q1):
return ("Q1")
if any(mon in month for mon in Q2):
return ("Q2")
print tellQuarter("2018_JAN_BGD")
Output : 输出 :
Q1
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