## 2. Sets ##
import csv
legislators = list(csv.reader(open("legislators.csv", "r")))
gender = []
for ll in legislators:
gender.append(ll[3])
gender = set(gender)
print(gender)
## 3. Exploring the dataset ##
party = []
for ll in legislators:
party.append(ll[-1])
party = set(party)
print(party)
print(legislators)
## 4. Missing values ##
for row in legislators:
if row[3] == "":
row[3] = "M"
## 5. Parsing birth years ##
birth_years = []
for row in legislators:
parts = row[2].split("-")
birth_years.append(parts[0])
## 6. Try/except blocks ##
try:
float(hello)
except Exception:
print("Error converting to float.")
## 7. Exception instances ##
try:
int("")
except Exception as exc:
print(type(exc))
print(str(exc))
## 8. The pass keyword ##
converted_years = []
for element in birth_years:
year = element
try:
year = int(year)
except Exception:
pass
converted_years.append(year)
## 9. Convert birth years to integers ##
for row in legislators:
year = row[2].split("-")[0]
try:
birth_year = int(year)
except Exception:
birth_year = 0
row.append(birth_year)
## 10. Fill in years without a value ##
last_value = 1
for row in legislators:
if row[7] == 0:
row[7] = last_value
last_value = row[7]
Python入门：Error handling
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