han yin python midterm practice

main.py

#hello han

Problem 2: Write a function - sub count - that takes two arguments, a
string (s) and a substring (sub) , and returns the number of times sub
occurs in s.
For example:
x=‘you say hello and I say hello and they all say hello’
print(subcount(x,’hello’)) should print 3
print(subcount(x,’goodbye’)) should print 0
(Note: There is a python string function count that does the same
thing. But please don’t use it for the purpose of this exercise!)

def sub_count(s, sub):
    count = 0
    location = 0
    while location < len(s):
        if (s[location:].find(sub) >= 0):
            count += 1
            location += s[location:].find(sub) + len(sub)
        else:
            break
    return count

x = 'you say kkhellojj and I say hello and they all say hello'
print(sub_count(x, 'hello'))

def ss(str, substr):
  words = str.split()
  occurences = 0
  for word in words:
    if word == substr:
      occurences = occurences + 1
  return occurences
  
  #Alternative solution
def sub_count2(s,sub):
    return len(s.split(sub))-1

x='you say hello and I say hello and they all say hello'

#x.split('hello') will return {"you say ", " and I say ", " and they all say "}

print(sub_count(x,'hello'))

def sub_count(s,sub):
    count=0
    location = 0
    while location < len(s):
        if (s[location:].find(sub) > 0):
            count+=1
            location+= s[location:].find(sub) + len(sub)
        else:
            break
    return count

x='you say kkhellojj and I say hello and they all say hello'
print(sub_count(x,'hello'))

def sub_count2(s,sub):
    return len(s.split(sub))-1

x='you say hello and I say hello and they all say hello'
print(x.split('hello'))
print(sub_count2(x,'hello'))

def straighten_name(name_string):
	ln,fn=name_string.split(', ')
	return fn+' '+ln
	
def straighten_name(name_string):
	if name_string.find(',') < 0 :
		return name_string
	ln,fn=name_string.split(', ')
	return fn+' '+ln

def straighten_name(name_string):
	if name_string.find(',') < 0 :
		return name_string
	names=name_string.split(', ')
	return names[1]+' '+names[0]

name1="Who, Doctor"
print(straighten_name(name1))
name2="mary jane"
print(straighten_name(name2)) # this produces an error but ur professor said to handle it if you cant do it so i dont agree with his solutuon
    

hello jimmy

haha hannys no github

remeber i was just telling you about how chinese try to ddos github

yeah

There's one problem I don't understand:

Problem 3: Write a function - straighten_name - that takes one
argument, a string containing a name in the Last_Name, First_Name
format. The function should parse the string and return a string in
the form First_Name Last_Name. If it can’t do this, then it should
merely return the original string.
For example:
name1=“Who, Doctor”
name2=“William Dalrymple”
print(straighten_name(name1)) should print Doctor Who
print(straighten_name(name2)) should print William Dalrymple

Solution from professor:
def straighten_name(name_string):
ln,fn=name_string.split(', ')
return fn+' '+ln

name1="Who, Doctor"
print(straighten_name(name1))