I am using python 3.9 and attempting to take information from a python list and a python dictionary and iterate through it for a loop. The correct email address will be taken from the dictionary depending on the unit.
When I execute my code, it loops three times over each member of the list, and I don't know how to make it not do that. I believe the initial for loop is executed ok and gets the metal, but is it the second loop that's making it run three times per item, and how do I fix it?
I realize this is pretty noddy, but I must be making fundamental mistakes somewhere, and after trying to figure it out for the last 5 hours, it's now time to ask for some help.
# Dictionary of metals and email addresses
metals = {
'gold':'1@gmail.com',
'silver':'2@gmail.com',
'platinum':'3@gmail.com',
}
# Variable holding some string data
gold = """
Gold is a chemical element with the symbol Au and atomic number 79,
"""
silver = """
Silver is a chemical element with the symbol Ag and atomic number 47.
"""
platinum = """
Platinum is a chemical element with the symbol Pt and atomic number 78.
"""
units = [gold, silver, platinum]
# What I want to do is have a loop where it takes the item in the list
#, for example, gold, matches it with the key to that in the dictionary, thereby
# enabling me to send gold to 1@gmail.com, silver to 2@gmail.com, and platinum to
# 3gmail.com
for unit in units:
for metal in metals.items():
if unit == gold:
email_address = metals.get('gold')
print(email_address)
elif unit == silver:
email_address = metals.get('silver')
print(email_address)
elif unit == platinum:
email_address = metals.get('platinum')
print(email_address)
else:
print('No Match')
# just some code to print out various bits of information
# Print our Dictionary Keys
for k in metals.keys():
print('Keys: ' + k)
# Print our dictionary Values
for v in metals.values():
print('Values: ' + v)
# print out the values held in our list
for item in units:
print('Items: ' + item)
and here is the output:
1@gmail.com
1@gmail.com
1@gmail.com
2@gmail.com
2@gmail.com
2@gmail.com
3@gmail.com
3@gmail.com
3@gmail.com
Keys: gold
Keys: silver
Keys: platinum
Values: 1@gmail.com
Values: 2@gmail.com
Values: 3@gmail.com
Items:
Gold is a chemical element with the symbol Au and atomic number 79,
Items:
Silver is a chemical element with the symbol Ag and atomic number 47.
Items:
Platinum is a chemical element with the symbol Pt and atomic number 78.
Just remove the inner for
loop, changing this:
for unit in units:
for metal in metals.items():
if unit == gold:
email_address = metals.get('gold')
print(email_address)
elif unit == silver:
email_address = metals.get('silver')
print(email_address)
elif unit == platinum:
email_address = metals.get('platinum')
print(email_address)
else:
print('No Match')
to this:
for unit in units:
if unit == gold:
email_address = metals.get('gold')
print(email_address)
elif unit == silver:
email_address = metals.get('silver')
print(email_address)
elif unit == platinum:
email_address = metals.get('platinum')
print(email_address)
else:
print('No Match')
There's no rule that says you need to be iterating over metals
in order to call metals.get
.
There are 3 items in metals.items()
. This is why the loop runs 3x. Just remove that statement; you don't need that loop
for unit in units:
if unit == gold:
...
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