Question

我正在尝试确定搜索字典键值的最佳方法。

我似乎无法找到一个允许我在列表列表中搜索特定字符串的函数。我正在尝试让程序显示某个类型的学期。

即。输入“ENGR”并返回它显示在“fall14”，“fall15”和“spring16”中。

有人能指出我从列表中的列表中提取数据的正确方向吗？我想我可能需要重新调整我定义键的方式。

Classes = dict()
Classes["FALL14"] = ("ENGR","156","01",'Engineering 3'),("ENGR","156","01",'Engineering 4'),("SCI","156","01",'Chemistry 1'),("ENGL","156","01",'Writing 1')
Classes['SPRING15'] =("ENGL","156","01",'Writing 2'),("MATH","156","01",'Calculus 1'),("MATH","156","01",'Calculus 2'),("MATH","156","01",'Calculus 3')
Classes['FALL15'] =("MATH","156","01",'Differential Equations'),("ENGR","156","01",'Solid Works'),("ENGR","156","01",'MATLAB'),("ENGR","156","01",'Dynamics')
Classes['SPRING16'] = ("ENGR","156","01",'Statics'),("ART","156","01",'Drawing 1'),("ENGR","156","01",'Fluid Dynamics'),("ENGR","156","01",'Thermodynamics 1')


for semester, information in Classes.items():   #Prints semesters that a class type was taken.
    if information ==  "ENGR":
        print(semester)

Answer 1

假设您要比较的字符串始终位于嵌套元组的第0个索引处，您可以使用any()匹配内容，如：

my_str = "ENGR"

#                             v  as per PEP naming convention, it should 
#                             v  start with lower-case
for semester, informations in Classes.items():
    if any(item[0]==my_str for item in informations):
        #       ^  check element at 0th index of each sub-tuple 
        #          for the match with `my_str`
        print(semester)  # OR, print(semester.lower()) to print the lower cased
                         # string as mentioned in desired result

将打印：

FALL14
FALL15
SPRING16

Answer 2

你需要再降低一级。你的循环给你一组集合。然后，您需要迭代这些集

set pri=20
set sec=20
set proddataset=IPP.PROD
set dsntype=cylinders
set recfm=fb
set lrecl=27998
set blksize=27998
set volume=PPINS2

echo quote site pri=%pri% sec=%sec% %dsntype% recfm=%recfm% lrecl=%lrecl% blksize=%blksize% volume=%volume%

Answer 3

试一试。您需要继续深入研究数据结构。

Classes = dict()
Classes["FALL14"] = ("ENGR","156","01",'Engineering 3'),("ENGR","156","01",'Engineering 4'),("SCI","156","01",'Chemistry 1'),("ENGL","156","01",'Writing 1')
Classes['SPRING15'] =("ENGL","156","01",'Writing 2'),("MATH","156","01",'Calculus 1'),("MATH","156","01",'Calculus 2'),("MATH","156","01",'Calculus 3')
Classes['FALL15'] =("MATH","156","01",'Differential Equations'),("ENGR","156","01",'Solid Works'),("ENGR","156","01",'MATLAB'),("ENGR","156","01",'Dynamics')
Classes['SPRING16'] = ("ENGR","156","01",'Statics'),("ART","156","01",'Drawing 1'),("ENGR","156","01",'Fluid Dynamics'),("ENGR","156","01",'Thermodynamics 1')


for semester, information in Classes.items():   #Prints semesters that a class type was taken.    
    for course_info in Classes[semester]:
        if course_info[0] ==  "ENGR":
            print(semester)

在字典中的列表中搜索列表中的字符串

3 个答案: