myDict.pop(“薯条”)
时间: 2023-10-02 10:11:09 浏览: 79
`myDict.pop("薯条")`是从字典中删除指定键的另一种方式,它会返回被删除的键所对应的值。语法格式为:
```
dict.pop(key[, default])
```
其中,`dict`是要删除元素的字典,`key`是要删除元素的键,`default`是可选的默认值,如果指定了默认值并且键不存在,则返回默认值。例如,考虑以下字典:
```
my_dict = {'苹果': 3, '香蕉': 2, '薯条': 1}
```
如果要删除键为'薯条'的元素,可以使用以下表达式:
```
value = my_dict.pop('薯条')
```
这个表达式会从`my_dict`字典中删除键为'薯条'的元素,并将其值1赋值给`value`变量,最终`my_dict`字典中只剩下两个元素'苹果': 3和'香蕉': 2。如果键不存在,则会抛出KeyError异常。如果指定了默认值并且键不存在,则返回默认值。
相关问题
mydict[i] = mydict.get(i,0)+1
This line of code assigns the value of `mydict.get(i, 0)` to the key `i` in the dictionary `mydict`.
The `get()` method returns the value of the specified key in the dictionary. If the key does not exist in the dictionary, it returns the second argument as the default value (in this case, `0`).
So, this line of code is basically checking if the key `i` already exists in the dictionary `mydict`. If it does, it assigns the current value of `mydict[i]` to `mydict[i]` (which doesn't change anything). If it doesn't, it assigns the default value of `0` to `mydict[i]`.
修改代码错误:mport openpyxl myBook = openpyxl.load_workbook('录取表.xlsx') mySheet = myBook['录取表'] myRange = list(mySheet.values) myDict = {} for myRow in myRange[3:]: if myRow[0] in myDict.keys(): myDict[myRow[0]] += [myRow] else: myDict[myRow[0]] = [myRow] for myKey, myValue in myDict.items(): myNewBook = openpyxl.Workbook() myNewSheet = myNewBook.active myNewSheet.append(myRange[:2]) for myRow in myValue: myNewSheet.append(myRow) myNewSheet.title = myKey+'录取表' myPath = '结果表-'+myKey+'录取表.xlsx' myNewBook.save(myPath)
import openpyxl
myBook = openpyxl.load_workbook('录取表.xlsx')
mySheet = myBook['录取表']
myRange = list(mySheet.values)
myDict = {}
for myRow in myRange[2:]:
if myRow[0] in myDict.keys():
myDict[myRow[0]].append(myRow)
else:
myDict[myRow[0]] = [myRow]
for myKey, myValue in myDict.items():
myNewBook = openpyxl.Workbook()
myNewSheet = myNewBook.active
myNewSheet.append(myRange[0])
myNewSheet.append(myRange[1])
for myRow in myValue:
myNewSheet.append(myRow)
myNewSheet.title = myKey + '录取表'
myPath = '结果表-' + myKey + '录取表.xlsx'
myNewBook.save(myPath)
这个代码有两个错误,第一个是在第2行缺少一个空格,应该写成 "import openpyxl";第二个错误是在第9行,应该使用 ".append" 方法而不是 "+=" 方法。