Answer:
When the program raises an exception as soon as the end of the is reached, this exception makes the input process difficult. We have no specific or clear way to encounter the end of the file before the exception is raised.
So to resolve this Python's try except statement can be used. This statement catches the exception and enables the program to recover. We can construct an input file loop. This loop will keep loading objects until the end of the file is detected. Below is an example to load objects from the file into a new list.
lst=list()
fileObj = open("item.dat","rb")
while True:
try:
item= pickle.load(fileObj)
lst.append(item)
except EOFError:
fileObj.close()
break
print(lst)
The file name is item.dat and new list is named as lst. When the end of the file is encountered EOFError is raised and except clause with EOFError closes the input file and breaks out of the loop.
Answer:
Trial westward expansion.
Explanation:
In old West America, trails werecommon means of travelling.
they were used by immigrants in the 19th century .
as a substitute to other means of transport it was widely concidered by the imigrants and its pioneers.
The immigrants started occupying the North parts of America .
The major parts of settlement were great Plains as part of the mighty overland migrations of 19th century.
They moved as aresult of major motives such as ,
- religious persecution,
- economic incentives.
This took place in the 19th century.
The answer Portugal and Spain and France and Britan
Answer:
True
Explanation:
In the given problem, it is essential that the applied force is proportional to the reaction and in the opposite direction. If the force is less than the estimated value, the necessary pressure will not be created. On the other hand, if the force is the same as or more than the estimated value, the required pressure will be created.