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import matplotlib.pyplot as plt

X = range(1991, 2011+1)
Y = [1 for year in X]

plt.plot(X, Y)
plt.show()

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...
locator = YearLocator(1)
locator.set_axis(plt.axis)
...

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from datetime import datetime

import matplotlib.pyplot as plt
from matplotlib.dates import YearLocator

X = []
for year in range(1991, 2011+1):
    if year == 2000:  # Ein Jahr Lücke
        continue
    X.append(datetime(day=1, month=1, year=year))
Y = [1] * len(X)

locator = YearLocator(1)
locator.set_axis(plt.axis)

print(f"len Y: {len(Y)}")
print(f"len X: {len(X)}")

plt.violinplot(Y, positions=X)
plt.show()

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from datetime import datetime

import matplotlib.pyplot as plt
from matplotlib.dates import YearLocator
import numpy as np


X_years = range(1991, 2011 + 1)
X = [datetime(day=1, month=1, year=year) for year in X_years]
Y = [1] * len(X)
data = [X_years, Y]  # Auch mit numplot experimentiert

# locator = YearLocator(1)
# locator.set_axis(plt.axis)

print(f"len X: {len(X)}, len Y: {len(Y)}, len X_years: {len(X_years)}")

plt.violinplot(data)  # , positions=X_years)
plt.show()

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import matplotlib.pyplot as plt
import numpy as np

figure,ax = plt.subplots()

Jahre = []
for year in range(1991, 1995):
    Jahre.append(year)
ax.set_xticks(np.arange(len(Jahre)))
ax.set_xticklabels(Jahre)

record1=[1,2,3,4,5,6,7,8,9,10]
record2=[2,4,3,7,12,4,1,19,7,5]
record3=[0.3, 0.1, 0.7, 0.1, 0.1, 0.7, 0.9, 1, 3, 0.5]

data=[record1,record2, record3]
plt.violinplot(data)

plt.gcf().autofmt_xdate()
plt.show() 

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import random
import matplotlib.pyplot as plt
import numpy as np

figure,ax = plt.subplots()

begin = 1991
end = 2011
Jahre = []
data = []
for year in range(begin, end+1):
    if year == 2000:
        continue
    Jahre.append(year)
    data.append(random.sample(range(10, 30), 10))
ax.set_xticks(np.arange(len(Jahre)))
ax.set_xticklabels(Jahre)

plt.violinplot(data)#, positions=Jahre)

plt.gcf().autofmt_xdate()
plt.show() 

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ax.set_xticks(np.arange(len(Jahre))+1)

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import random
import matplotlib.pyplot as plt
import numpy as np

figure,ax = plt.subplots()

begin = 1991
end = 2011
Jahre = []
data = []
for year in range(begin, end+1):
    if year == 2000:
       continue
    Jahre.append(year)
    data.append(random.sample(range(10, 30), 10))

plt.violinplot(data, positions=Jahre)

plt.gcf().autofmt_xdate()
plt.show()

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import random
from matplotlib import pyplot as plt

keys = []
values = []
for year in range(1992, 2011+1):
    if year == 1994:
        continue
    keys.append(year)
    values.append(random.sample(range(10, 30), 3))
print(f"keys: {keys}; type: {type(keys[5])}")
print(f"values: {values}")

#plt.gcf().autofmt_xdate()
plt.violinplot(values, positions=keys)

plt.show()